multifunction synthesizer wf1943bthe wf1943b wave factory is a multifunctional synthesizer based on...

INSTRUCTION MANUAL

NF Corporationhttp://www.nfcorp.co.jp/ NF Corporation6-3-20, Tsunashima-higashi, Kohoku-ku,Yokohama 223-8508 JAPAN

WF1943B

MULTIFUNCTION SYNTHESIZER

MU

LTIFUN

CTIO

N SYN

THESIZER

WF1943B

DA00012503-002

WF1943B MULTIFUNCTION SYNTHESIZER Instruction Manual

WF1943B i

Foreword

Thank you very much for procuring the WF1943B MULTIFUNCTION SYNTHESIZER. At the outset,

please take a few minutes to read the Safety Precautions indicated in this manual in order to use this equipment

safely and correctly.

Warning and Caution notices

The following Warning and Caution notices appear in this manual. These must be observed in order to

protect both the user from physical harm and the equipment from damage.

Risk of serious and possibly fatal physical injury from electric shock or other cause.

Risk of damage to the equipment.

Manual composition

Please read Section 1 before using the equipment for the first time. Refer to a separate volume for a

description of remote control (GPIB or USB).

Section 1 Overview

Provides a general description of the equipment and a simple outline of the operating principles.

Section 2 Preparation

Required preparatory work before installing and operating the equipment. Be sure to read this

section.

Section 3 Basic operation

Panel functions, operating principles and basic operations are described. Read while operating

the equipment.

Section 4 Applications

Expanded operations are described.

Section 5 Other operations

Operations not covered in Sections 3 and 4 are described.

Section 6 Troubleshooting

Corrective measures when error messages or abnormalities occur.

Section 7 Maintenance

Inspection and performance tests are described.

Section 8 Specifications

Equipment specifications (functions and performance) are described.

!! WARNING

! CAUTION

ii WF1943B

Safety Precautions

Observe the following warnings and cautions in order to use this equipment safely. No responsibility or

warranty is assumed for damages arising from use in a manner contrary to these warnings and cautions.

This product is an insulation standard class I device (with a protective conductor terminal) as defined by the

IEC standards.

Observe text instructions

This manual has been compiled in order to enable safe operation and use of this equipment. Be sure to read

this manual before using the equipment.

Items designated by Warning advise of serious physical hazards. Be sure to observe these carefully.

Be sure to connect ground

Since the unit includes a built-in line filter, there is risk of shock if used without grounding.

To prevent electric shock, be sure to properly connect the device to the electric ground which ground

resistance is less than 100 Ω.

Confirm power source voltage

Before connecting this equipment, check that the proper voltage is being supplied to the power outlet.

Refer to the Grounding and Power Supply section of this manual.

Use only the properly rated fuse

Improperly rated fuses present a fire hazard and other risks. Refer to the Grounding and Power Supply

section of this manual and confirm the fuse rating.

Be sure to disconnect the equipment from the power source before replacing the fuse.

Smoke, odor, noise

In event smoke, peculiar odor or noise is emitted, immediately disconnect the power source and avoid further

operation. Contact service.

Flammable gas

Do not use this equipment in the presence of flammable gas. There is danger of fire and explosion.

Do not remove covers

This equipment contains dangerously high voltages. Do not remove external covers.

Refer all internal inspection and service to a qualified service technician who fully understands the hazards.

Safety Precautions

WF1943B iii

!! WARNING

Do not modify

Do not use parts other than specified by the manufacturer and by no means attempt to modify the equipment.

There is risk of personnel hazard and damage to the equipment. The manufacturer reserves the option of

refusing service in such cases.

Safety related symbols and indications

Following are general definitions of the symbols and indications used in the text and on the product.

!

Advises of possible hazard to the user, as well as the need to consult this manual when

using an operation or function.

Appears in the text and on the product to advise risk of fatal or otherwise serious

physical injury.

Appears in the text and on the product to advise risk of damage to the product.

Ground indication:

Indicates connector housing and signal ground is connected to a chassis ground.

Indicates power switch on state.

Indicates power switch off state.

! CAUTION

WF1943B Contents 1

Contents

Foreword ················································································································································ i

Safety Precautions ·································································································································· ii

Section 1 Overview ·····························································································································1-1

1.1 Features ··························································································································1-2 1.2 Operating principles········································································································1-3

Block diagram·········································································································1-3 1.3 Function outline··············································································································1-4

Function tree ···········································································································1-4

Section 2 Preparation···························································································································2-2

2.1 Check before using ·········································································································2-2 Safety check············································································································2-2 Unpacking and repacking························································································2-2

2.2 Power source and grounding···························································································2-3 Grounding···············································································································2-3 Line filter ················································································································2-3 Power source···········································································································2-3 Power supply fuse ···································································································2-5

2.3 Installation ······················································································································2-6 Cautions··················································································································2-6 Installation conditions ·····························································································2-6 Panel and case cleaning···························································································2-6

2.4 Conformable standards ···································································································2-7 2.5 Calibration ······················································································································2-8

Section 3 Basic Operation ···················································································································3-1

3.1 Panel description·············································································································3-2 Front panel ··············································································································3-3 Rear panel ···············································································································3-4

3.2 Input and output connectors ····························································································3-5 Waveform output (FUNCTION OUT) ····································································3-5 Sync signal output (SYNC OUT)············································································3-6 Trigger/sweep input (TRIG/SWEEP IN)·································································3-9

Contents

Contents 2 WF1943B

3.3 Basic operation ···············································································································3-10 Setting initialize (PRESET) ····················································································3-10 Oscillation mode selection ······················································································3-13 Waveform selection ································································································3-14 Frequency setting ···································································································· 3-17 Amplitude setting···································································································· 3-18 DC offset setting ·····································································································3-19 Phase setting ···········································································································3-20 Output on/off ·········································································································· 3-21

Operation tree ········································································································· 3-22

Section 4 Applications·························································································································4-1

4.1 Burst oscillation ··············································································································4-3

Burst oscillation (Type: Burst) ················································································4-3 Burst oscillation (Type: Trigger)·············································································4-6 Burst oscillation (Type: Gate) ·················································································4-10 Burst oscillation (Type: Triggered Gate)································································· 4-13

4.2 Sweep ·····························································································································4-16

Sweep (Mode: Single)·····························································································4-16 Sweep (Mode: Continuous)·····················································································4-22 Sweep (Mode: Gated) ·····························································································4-26 CENTER, SPAN····································································································· 4-33 Summary of the sweep setting items ·······································································4-34 Sweep (Modulation) steps and step width ·······························································4-35 Sweep value and SYNC OUT ·················································································4-36

4.3 Modulation ·····················································································································4-37

Frequency modulation (FM) ···················································································4-37 Phase modulation (PM)···························································································4-40

4.4 Arbitrary Waveform········································································································4-43

Arbitrary waveform (ARB) ·····················································································4-43 4.5 Selecting waveforms of synchronous signals (SYNC OUT) ···········································4-48

Procedure ················································································································4-48 When the oscillation mode is BURST····································································· 4-48 When the oscillation mode is SWEEP·····································································4-49 When the oscillation mode is MODU ····································································· 4-49 Additional information:···························································································4-50

4.6 Output waveforms for sweeping and modulation ····························································4-51

4.7 Equivalent noise bandwidth ···························································································· 4-53

Contents

WF1943B Contents 3

Section 5 Other Operations··················································································································5-1

5.1 Convenient Settings ········································································································ 5-2

Frequency [Hz] setting by period [s] ·······································································5-2 Squarewave duty setting ·························································································5-3 Squarewave pulse width setting ··············································································5-4 Amplitude and DC offset setting by high and low level ··········································5-5

5.2 Units ·······························································································································5-7

Engineering unit (µ, m, k, M) display ·····································································5-7 Amplitude units change ··························································································5-8 User-unit setting······································································································5-9

5.3 Setting memory···············································································································5-13

Setting store ············································································································5-13 Setting recall ···········································································································5-14 Setting memory clear ······························································································5-15

5.4 Other settings··················································································································5-16

Output range change (use with fixed range) ····························································5-16 Output on/off at power on ······················································································· 5-17 LOAD function (equalize setting and output values) ··············································5-18 UNDO function······································································································· 5-19 Pulse generator function··························································································5-20

Phase initialization ··································································································5-22

Section 6 Troubleshooting···················································································································6-1

6.1 Error message ·················································································································6-2 Power on error ········································································································ 6-2

Operation error········································································································6-3 6.2 Suspected failure·············································································································6-6

In case of abnormality·····························································································6-6

Section 7 Maintenance·························································································································7-1

7.1 Outline ····························································································································7-2

Work contents ········································································································· 7-2 Required test instruments ························································································7-2

7.2 Operation checks ············································································································7-3

Preparatory checks ··································································································7-3 Function checks ······································································································7-3

Contents

Contents 4 WF1943B

7.3 Performance tests············································································································7-5

Performance tests ····································································································7-5 Preparatory checks ··································································································7-5 Test preparation ······································································································7-5 Frequency accuracy ································································································7-5 Amplitude accuracy ································································································7-6 DC offset accuracy··································································································7-6 Amplitude vs. frequency characteristics··································································7-7 Sinewave distortion·································································································7-7 Squarewave response ······························································································7-8 Duty factor ·············································································································· 7-8

Section 8 Specifications·······················································································································8-1

8.1 Waveform and output characteristics ·············································································· 8-2 8.2 Output voltage ················································································································8-4 8.3 Other functions ···············································································································8-5 8.4 Initialized settings··········································································································· 8-9 8.5 Remote control ···············································································································8-10 8.6 General items·················································································································· 8-11

External drawing·····································································································8-12

Index ······················································································································································ Index

WF1943B 1-1

Section 1 Overview

1.1 Features ·····················································································································1-2 1.2 Operating principles···································································································1-3

Block diagram····································································································1-3 1.3 Function outline·········································································································1-4

Function tree ······································································································1-4

1-2 WF1943B

1.1 Features

The WF1943B Wave Factory is a multifunctional synthesizer based on the direct digital synthesizer (DDS) system. Although the WF1943B is 1-channel, the series also includes the 2-channel WF1944B, the single-channel WF1945B with multiple functions, and the 2-channel WF1946B with additional multiple functions.

Frequency setting range : 0.01 µHz to 15 MHz Maximum output voltage : 20 Vp-p/open, ±10 V/open Waveform resolution: 14 bits Key navigation lights the next keys to be operated, thus improving operational ease. User units function allows setting formula and character string to convert settings and display to the

desired units. LOAD function aligns the setting and actual output voltages when an arbitrary load impedance in

connected. Convenient use as a pulse generator with pulse period, width, high level and low level setting and

display. A trigger delay function is also included. Five standard waveforms: sinewave, triangular wave, squarewave, rising sawtooth and descending

sawtooth, plus arbitrary waveform. Frequency change and frequency sweep are coupled with phase, avoiding waveform cutoff. Unpredicted voltage is not produced during amplitude change. Since the output range is fixed, the

amplitude can be changed from 0 to maximum without waveform cutoff. Versatile oscillation modes

・Continuous

・Intermittent: Burst, trigger, gate, in addition to triggered gate for repeated oscillation start/stop ・Sweep: Frequency, phase ・Modulation: FM (FSK), phase (PSK) ・White noise generator ・DC voltage generator

Floating inputs and outputs to prevent ground loop effects.

WF1943B 1-3

1.2 Operating principles

Block diagram

Dis

play

and

pan

el k

ey

Wav

efor

m m

emor

y

Am

plitu

de c

ontro

l

occurrence

Others

TRIG/ SWEEP

IN

GPIB

Ｄ／Ａ

ＬＰＦ

ＤＤＳ

ＣＰＵ

ＡＴＴ

Clock

Offset D/A

SYNC OUT

14bit

16bit

OUT

FUNCTION

Over level Detector

USB

Isolation

The CPU conducts analog control for display, panel keys, remote control (GPIB, USB), DDS,

amplitude and DC offset. Sweep/internal modulation are also conducted. The clock generator produces DDS reference and CPU clock signals. An isolation circuit between the CPU and DDS provides floating functions. The DDS (Direct Digital Synthesizer) uses an original LSI device and generates digital data of

the setting frequency. The waveform memory converts digital data from the DDS into standard or arbitrary waveform

data. Waveform data are set from the CPU. The digital to analog (D/A) converter produces an analog signal from the resulting waveform

data. The lowpass filter (LPF) smoothes the stepped D/A output signal. Amplitude control is set by the gain control. DC offset is produced by the offset D/A converter

and the output amplifier adds and amplifies the output signal. The attenuator (ATT) selects the output range by 1/10 attenuation on/off.

1-4 WF1943B

1.3 Function outline

Function tree • Oscillation mode selection

The oscillation type can be set for continuous, intermittent, sweep, modulated, noise or DC. • Waveform selection

The waveform type can be set for sinewave ( ), triangle waveform ( ), squarewave ( , 50 % fixed duty), squarewave ( , variable duty), rising sawtooth ( ), descending sawtooth ( ), or arbitrary (ARB).

• Frequency setting

The frequency can be set by the keypad or modify dial. The period, i.e., inverse of frequency, can also be set. The duty and pulse width can also be set for the variable duty squarewave.

• Amplitude setting

The amplitude can be set by the keypad or modify dial. • DC offset setting

The DC offset can be set by the keypad or modify dial. • Phase setting

Phase between channels and oscillation starting phase during burst oscillation can be set. • Output on/off

The waveform and sync signal output connectors are on/off switchable for each channel. The setting prior to power off is returned at power on. Be sure to set to either on or off as required.

• User units setting

Coefficients and compensation can be applied to frequency, period, amplitude, DC offset, phase and duty for setting and displaying these in desired units. The units can be expressed by up to 4 desired characters.

• Setting store and recall

The settings for frequency, amplitude, etc., can be stored and recalled. The WF1943B is capable of 10 combinations store/recall.

• Computer control

Remote control (GPIB or USB) enables external control from a personal computer.

WF1943B 2-1

Section 2 Preparation

2.1 Check before using ····································································································2-2 Safety check·······································································································2-2 Unpacking and repacking···················································································2-2

2.2 Power source and grounding······················································································2-3 Grounding··········································································································2-3 Line filter ···········································································································2-3 Power source······································································································2-3 Power supply fuse ······························································································2-5

2.3 Installation ·················································································································2-6 Cautions·············································································································2-6 Installation conditions ························································································2-6 Panel and case cleaning······················································································2-6

2.4 Conformable standards ······························································································2-7 2.5 Calibration ·················································································································2-8

2-2 WF1943B

2.1 Check before using

Safety check Before using the WF1943B, refer to the Safety precautions of this manual and confirm safety. Also, before connecting the power, refer to Section 2.2 Power source and grounding and thoroughly check the safety.

Unpacking and repacking First, inspect the equipment for possible damage in shipping. Check for the presence of the following items.

Mainframe ·······························································································1 Instruction Manual···················································································1 Remote Control Instruction Manual·························································1 0105 Arbitrary Waveform Editor (CD-ROM)··········································1 Supplied accessories

Power cable: (3-conductors)································································1 Fuse : (100/115 V: 1 A or 230 V: 0.5 A) ··································1 (Time lag, 250 V, φ5.2 × 20 mm)

For information on how to use 0105 Arbitrary Waveform Editor, refer to the CD-ROM of the 0105. When repacking the equipment for transportation, use a packing carton having ample strength to protect the equipment and bear the weight of stacking.

Do not remove covers. This equipment contains dangerously high voltages. Do not remove external covers. Refer all internal inspection and service to a qualified service technician who fully understands the hazards.

!! WARNING

WF1943B 2-3

2.2 Power source and grounding

Grounding

This equipment must be grounded in order to prevent electric shock accidents. Confirm the protective ground terminal is connected to ground before connecting the equipment for measurements. The WF1943B protective ground is connected to ground by the 3-prong power supply plug. Use the supplied power supply cable to connect to a 3-terminal power outlet that has a protective ground contact.

Line filter The WF1943B uses a line filter that incorporates the circuit below. Because the maximum leakage current is 0.5 mArms at 250 V/62 Hz, touching a metallic part of the WF1943B could cause an electric shock. For your safety, be sure to ground the device.

Power source

Be sure to observe the following in order to prevent damage to the equipment. Confirm the power source voltage is within the range specified for the WF1943B.

!! WARNING

Fuse

To power switch

Chassis

! CAUTION


2-4 WF1943B

Check the power source voltage indication on the rear panel above the power source inlet. The WF1943B operates from the following commercial power source.

Power supply voltage range: AC100V/115V/230V±10% Power supply frequency range: 50/60 Hz ±2 Hz Power consumption: Max. 65 VA Overvoltage category: II

Connect to the power source according to the following procedure: 1. Set the WF1943B power switch to off. 2. Adjust the source voltage change-over switch at the back of the unit to the source voltage to be used. 3. Insert the power cable into the power inlet on the back of the unit. 4. Insert the power cable plug into a 3-terminal wall socket. With a screwdriver, move the slide control of the source voltage change-over switch to the line indicating the source voltage to be used. Do not set the slide control between lines.

VOLTAGE SELECTOR

100V 115V 230V

VOLTAGE SELECTOR

100V 115V 230V

Before using the WF1943B with a source voltage that differs from the factory setting, be sure to contact the sales representative of NF Corporation. Make sure that the power switch is off before connecting the power cable. Also, after switching power off, wait at least five seconds before switching the power on again. Confirm the power switch is off before connecting the power cable. Also, after switching power off, wait at least 5 seconds before again switching power on.


WF1943B 2-5

Power supply fuse

Use only a fuse with the specified rating. There is risk of fire from an improperly rated fuse. Be sure to disconnect the power cable before replacing the fuse.

Fuse: Time lag 1 A (100/115 V) or time lag 0.5 A (230 V) 250 V, φ5.2 × 20 mm The specified rating of a fuse changes depending on the power source voltage.

!! WARNING

2-6 WF1943B

2.3 Installation

Cautions

Observe the following cautions to avoid damaging the WF1943B.

The unit is cooled by a fan. In event the fan does not function, switch off the power and contact service. Continued use without the fan operating can lead to extensive damage and service complexity.

Ventilation openings are located on the side and rear panels. Avoid obstructing the openings and provide at least 10 cm clear space at the sides and back of the unit when installing.

Do not use the unit vertically (with the rear panel downward).

Installation conditions

Observe the following ambient when installing and storing the equipment. Moisture condensation must also be absent.

Temperature and humidity ranges Guaranteed performance: +5 to +35 C, 5 to 85 %RH (no condensation at an absolute humidity of 1 to 25 g/m3) Ambient storage conditions: -10 to +50 C, 5 to 95 %RH (no condensation at an absolute humidity of 1 to 29 g/m3)

Pollution degree : 2

Avoid installing the equipment in the following types of locations. In direct sunlight or near heat sources Where subjected to dust, salt or metallic dust Corrosive gas, steam or oily smoke Flammable gas or vapors Strong vibration Strong magnetic or electromagnetic fields Near pulse type noise sources

Also, when using, provide separation between the power cords and signal cables of the WF1943B and those of other equipment. Operating error can occur if the power cords and signal cables are too close. Cable routing requires particular attention when installing in a rack or other facility.

Panel and case cleaning Use a soft cloth to wipe dust from the panel and case. If soiling is severe, moisten the cloth slightly with a neutral detergent. Do not use sprays, petroleum distillates or commercial cleaning cloths, which can deform or peel the finish.

! CAUTION

WF1943B 2-7

2.4 Conformable standards

The WF1943B conforms to the following standards. Safety: EN 61010-1: 2001 EMC: EN 61326: 1997/A1: 1998/A2: 2001 However, the performance criteria for the following standards are as follows: EN61000-4-2(1995), EN61000-4-4(1995), EN61000-4-5(1995), and EN61000-4-11(1994):B The following cables are used for the test of EN 61326: 1997/A1: 1998/A2: 2001 • Power cable : Accessory • Signal cables : Coaxial cable with BNC connectors, 1 m (3D-2W or RG-143B/U or RG-223/U) • GPIB cable : Shielded cable, 1 m (DDK: 408JE-101)

WF1943B 2-8

2.5 Calibration

Section 7.3 the Performance tests are recommended at least once a year. These should also be conducted before important tests and measurements.

WF1943B 3-1

Section 3 Basic operation

3.1 Panel description········································································································3-2 Front panel ·········································································································3-3 Rear panel ··········································································································3-4

3.2 Input and output connectors ·······················································································3-5 Waveform output (FUNCTION OUT) ·······························································3-5 Sync signal output (SYNC OUT)·······································································3-6 Trigger/sweep input (TRIG/SWEEP IN)····························································3-9

3.3 Basic operation ··········································································································3-10 Setting initialize (PRESET) ···············································································3-10 Oscillation mode selection ·················································································3-13 Waveform selection ···························································································3-14 Frequency setting ·······························································································3-17 Amplitude setting·······························································································3-18 DC offset setting ································································································3-19 Phase setting ······································································································3-20 Output on/off ·····································································································3-21 Operation tree ····································································································3-22

・Following is an example of the display when using this section.

Fully lighted (bold) Flashing

ＰＲＥＳＥＴＳＹＳＴＥＭ：ＲＡＮＧＥＰＲＥＳＥＴＵＳＥＲ-ＵＮＩＴ 4

Fully lighted (bold) Dimly lighted

3-2 WF1943B

3.1 Panel description

This section describes the indications and functions of the front and rear panels of the WF1943B.


WF1943B 3-3

Front panel

Set

ting

initi

aliz

e (p

age

3-10

), ou

tput

rang

e se

tting

(pag

e 5-

16),

user

uni

t set

ting

(pag

e 5-

9)

Trig

ger/s

wee

p in

put

conn

ecto

r (pa

ge 3

-9)

Syn

c si

gnal

ou

tput

co

nnec

tor (

page

3-6

) W

avef

orm

out

put c

onne

ctor

(p

age

3-5)

Pow

er o

n/of

f. D

epre

ss f

or p

ower

on,

pr

ess

and

rele

ase

to r

aise

d po

sitio

n fo

r pow

er o

ff.

Wav

efor

m s

elec

t (p

age

3-14

)

Freq

uenc

y an

d am

plitu

de

setti

ng (p

age

3-17

,3-1

8)

Osc

illat

ion

mod

e se

lect

ion

(pag

e 3-

13)

Dis

play

s fre

quen

cy, a

mpl

itude

, offs

et a

nd lo

ad

impe

danc

e se

tting

s, in

add

ition

to

info

rmat

ion

to a

ssis

t whe

n se

tting

.

Lam

ps l

ight

to

indi

cate

pre

sent

osc

illatio

n m

ode

and

wav

efor

m s

elec

tion.

Lam

p lig

hts

to in

dica

te o

utpu

t ran

ge.

Whe

n th

e ra

nge

is s

et fo

r au

tom

atic

sw

itchi

ng, t

he A

uto

lam

p lig

hts

(pag

e 5-

16).

The

OV

ER

la

mp

flash

es

whe

n th

e ou

tput

vo

ltage

ex

ceed

s th

e up

per l

imit

(pag

e 3-

5).

Out

put w

avef

orm

on/

off.

Key

lam

p lig

hts

whe

n on

, ext

ingu

ishe

s w

hen

off.

Key

butto

n, to

p or

bot

tom

lam

ps li

ght o

nly

for

oper

able

key

s.

Whe

n M

odify

lam

p lig

hts,

tur

n di

al t

o se

t va

lues

or p

aram

eter

s.

Ret

urn

to th

e pr

evio

us s

tep.

Und

o ke

y (p

age

5-19

)

Mem

ory

save

, rec

all,

etc.

(p

ages

5-1

3)

Pre

ss to

ent

er, e

.g.,

a nu

mer

ical

inpu

t.


3-4 WF1943B

Rear panel

Insp

ectio

n la

bel

Nam

epla

te

Fan

exha

ust

Fuse

hol

der (

page

2-5

)

Pow

er s

uppl

y in

put (

page

2-3

)

GP

IB c

onne

ctor

WF1943B 3-5

3.2 Input and output connectors

Waveform output (FUNCTION OUT)

50Ω

FUNCTION OUT

±42 Vpeak Output amp 50Ω

20dB ATT

Maximum output voltage : 20 Vp-p/open, 10 Vp-p/50 Ω load Output impedance : 50 Ω, unbalanced Load impedance: More than 45 Ω Output off status : Open when output off (can be modified for 50 Ω at output off. Consult

company.) Ground : Connected to signal ground (floating from chassis)

Avoid shorting the output or applying an external signal. The unit can be damaged.

・Output limiting

If the following voltages are exceeded by the amplitude, DC offset, the OVER lamp flashes and the output is clipped.

10 V range: Approx. 11 Vp/open 1 V range: Approx. 1.1 Vp/open

・Output connection note

The FUNCTION OUT impedance is 50 Ω. By using coaxial cable with 50 Ω characteristic impedance for connection to other equipment, amplitude accuracy at high frequency can be improved and waveform disturbance reduced. In addition, performance deterioration up to maximum frequency can be prevented by connecting to a terminal having 50 Ω input impedance or terminating the input at 50 Ω.

・Setting and output voltages

The setting voltage display and actual output voltage (load terminal voltage) differ according to the load resistance. “5.4 Other settings (LOAD function (equalize setting and output values))”, cf.

! CAUTION

3.2 Input and output connections

WF1943B 3-6

Sync signal output (SYNC OUT)

50Ω SYNC OUT

Output waveform :

Output voltage : 0 V/+5 V (open) Output impedance: 50 Ω, unbalanced Load impedance: More than 45 Ω Status at output off : High impedance Ground : Connected to chassis ground

Avoid shorting the output or applying an external signal. The unit can be damaged.

・Output connection note

The SYNC OUT impedance is 50 Ω. By using coaxial cable with 50 Ω characteristic impedance for connection to other equipment, waveform disturbance can be reduced. Although 50 Ω termination is possible, the high level voltage is reduced by about half.

・Waveform and sync signal output relationship (Waveform phase definition)

(1) Continuous oscillation mode (NORMAL)

① Sinewave

! CAUTION


WF1943B 3-7

② Triangular, rising sawtooth, descending sawtooth, arbitrary

③ Squarewave (fixed 50 % duty) (Phase definition)

FUNCTION OUT

Approx. 15ns

SYNC OUT

④ Squarewave (variable duty) (Phase definition)

FUNCTION OUT

Appendix. 14ns

SYNC OUT Jitter = 25ns p-p

Approximately 25 ns p-p jitter is also produced in the FUNCTION OUT waveform.

Rising and falling edge hysteresis zones vary with phase history.

Above 100 kHz with stop level off. At other times, see example ④ below.

Approximately 25 ns p-p jitter is also produced inthe FUNCTION OUT waveform when stop level isOn or 100 kHz and below.

Jitter 25 ns p-p (Stop level on or 100 kHz and below) 2.5 ns rms and below (Stop level off and between above 100 kHz and below 1 MHz) 1.0 ns rms and below (Stop level off and 1 MHz and above)

(Phase definition)


WF1943B 3-8

(2) Burst mode (BURST)

(3) Sweep mode (SWEEP) Low level during sweep from start to stop points. High level at other times.

“4.2 Sweep (Sweep value and SYNC OUT)”, cf.

(4) Modulation mode (MODU) High level when modulation waveform phase is above 0 and less than 180 degrees. Low level above 180 and below 360 degrees.

(5) Noise mode (NOISE) Digital (binary) noise source output.

(6) DC mode (DC) Always high level.


WF1943B 3-9

Trigger/sweep input (TRIG/SWEEP IN)

Signal characteristics: The following types are produced during the burst oscillation mode. Trigger: Select oscillation start for either or .

Gate: Select oscillation at either high or low level. Triggered gate: Oscillation start/stop at or . Select either.

Minimum pulse width is 50 ns. In sweep oscillation mode, the sweep starts at or . Select either.

Minimum pulse width is 200 ns. Input voltage : High level ≥ +3.9 V Low level ≤ +1.6 V Input voltage range : −0.5 to +5.5 V Input impedance : Pull up to +5 V at approx. 10 kΩ Ground : Connected to chassis ground

Do not apply a signal exceeding the above input voltage range. The unit can be damaged.

• Drive circuit examples

Connect the trigger and sweep input drive signals to TTL or C-MOS logic IC outputs. Since the input circuit is provided with a built-in pullup resistor, an open collector output drive can also be used. However, contact chatter from a mechanical switch or relay can prevent normal operation. Also, chattering will prevent normal operation when the oscillation mode is triggered gate. Avoid using a logic IC circuit having a power supply voltage higher than +5 V such as example (c) for the WF1943B input

! CAUTION

+5 V +12 V～

(a) TTL logic output (b) Open collector output (c) High voltage logic output

TRIG/SWEEP IN

+5 V

10 kΩ

100 Ω

Ｄ

WF1943B 3-10

3.3 Basic operation

Basic operation is described using an example of a triangular waveform with frequency 1 kHz, amplitude 2 Vp-p and DC offset +1 V from the waveform output connector.

Period(frequency):1ms(1kHz)

Setting initialize (PRESET)

The operation of initializing all settings is described. This instruction manual presumes operation directly after initializing.

Operation:

① Press the SYSTEM key, then use the and keys to produce the following display. (lower

PRESET flashes).

ＰＲＥＳＥＴＳＹＳＴＥＭ：ＲＡＮＧＥＰＲＥＳＥＴＵＳＥＲ－ＵＮＩＴ 4

② Press the ENTER key (upper PRESET flashes).

③ Again press the ENTER key to initialize. To return without initializing, before pressing ENTER

,

press the EXIT key twice.

3.3 Basic operation

WF1943B 3-11

Initialized settings：

Initialized settings are indicated in the table. Settings related to output on/off, output on/off at power on, arbitrary waveform, setting memory, user units , remote control, GPIB address, GPIB delimiter, and USB ID are not initialized.

Initialization table Key operation Menu Initial settings Remarks

MODE NORMAL

TYPE BURST

SOURCE EXT (1 ms, at INT) When TYPE=TRIG, GATE,T-GATE

DELAY 0.3 µs When TYPE=TRIG

MARK 1.0 When TYPE=BURST, TRIG

SPACE 1.0 When TYPE=BURST

MODE→BURST

STOP-LEVEL OFF (0%, at ON).

TYPE FREQ

SOURCE EXT (1 ms at INT) When MODE=SINGLE, GATED

MODE SINGLE

FUNCTION LIN

TIME 1 s

MODE→SWEEP

STOP-LEVEL OFF (0%, at ON). When MODE=GATED

START 1000 Hz

STOP 10000 Hz

CENTER 5500 Hz

MODE → SWEEP, TYPE=FREQ

SPAN 9000 Hz

START −90 deg

STOP 90 deg

CENTER 0 deg

MODE → SWEEP, TYPE=PHASE

SPAN 180 deg

TYPE FM

FREQUENCY 100 Hz

MODE→MODU

FUNCTION

MODE → MODU, TYPE=FM

DEVIATION 1000 Hz

MODE → MODU, TYPE=PM

DEVIATION 90 deg

ENTRY→FREQ 1000 Hz

ENTRY→AMPTD 0.1 Vp-p

ENTRY→OFFSET 0 V

ENTRY→PHASE 0 deg

Continued next page

3.3 Basic operation

WF1943B 3-12

Continued from previous page

Key operation Menu Initial settings Remarks

ENTRY→WIDTH 0.0005 s In case of FUNCTION=

ENTRY→DUTY 50 % In case of FUNCTION=

ENTRY→PERIOD 0.001 s

ENTRY→HIGH 0.05 V

ENTRY→LOW −0.05 V

FUNCTION

RANGE AUTO

LOAD OPEN (50 ohms at SET)

DUTY-VALID IMMED

SYSTEM

SYNC OUT STATE

3.3 Basic operation

WF1943B 3-13

Oscillation mode selection ( MODE )

Oscillation mode (continuous, burst, sweep, etc.) selection is described.

Terms: NORMAL (continuous): Continuous oscillation; normally use this mode. BURST : Intermittent oscillation (BURST, TRIG, GATE, T-GATE)

“4.1 Burst oscillation”, cf.

SWEEP : Item such as frequency is automatically varied. “4.2 Sweep”, cf.

MODU (modulation) : Modulated waveform output (FM, PM) “4.3 Modulation”, cf.

NOISE : White noise output DC : DC output

Operation:

The selected oscillation mode is indicated in the STATUS area, which is located to the left of MODE

key. When the MODE

key is pressed, the MODE

key lamp lights, and at the same time, the lamp

of every key located to the right of the MODE

key lights.

To use another oscillation mode (one whose key lamp is already lit), press the key of the mode.

Operation example: In this example, first set to DC, then to continuous (NORMAL).

① Press the MODE

key, then the DC

key to set the DC mode. The DC STATUS lamp lights.

② Press the MODE

key, then the NORMAL

key to set the NORMAL mode. The NORMAL STATUS lamp lights.

3.3 Basic operation

WF1943B 3-14

Waveform selection ( FUNCTION

)

Waveform selection is described.

Symbols: : Sinewave : Triangular wave

: Squarewave (50 % fixed duty) : Squarewave (variable duty) : Rising sawtooth : Descending sawtooth

ARB: Arbitrary waveform “4.4 Arbitrary Waveform (ARB)”, cf.

Operation:

The selected waveform is indicated in the STATUS area, which is located to the left of FUNCTION

key.

When the FUNCTION

key is pressed, the FUNCTION

key lamp lights, and at the same time, the lamp of

every key located to the right of the FUNCTION

key lights. The lamp of the selected waveform blinks.

To select another waveform (one whose key lamp is already lit), press the key of the waveform.

Operation example: In this example, a triangular waveform is selected.

① Press the FUNCTION

key, then the key.

The STATUS lamp lights

② After selecting, press the EXIT key once to exit the setting mode.

Other: In squarewaves (variable duty), pulses may disappear depending on the relations between the

cycle and duty when the pulse width falls below 25 ns. For such settings, an error message is displayed. When the pulse width is 100 ns or less, jitter becomes relatively larger compared with the pulse width, and a warning message is displayed.

If the pulse width falls below 25 ns, pulses may disappear.

If the pulse width falls below 100 ns, jitter becomes relatively larger compared with the pulse width.

3.3 Basic operation

WF1943B 3-15

If the phase of the squarewaves (fixed duty) or squarewaves (variable duty) is changed,

multiple pulses may be output in one cycle, as shown below.

If the duty of the squarewaves (variable duty) is changed, multiple pulses may be output in one

cycle, as shown below.

If the pulse width is larger than 75 ns after the duty is changed, it is possible to suppress the output of multiple pulses in one cycle. Therefore, set DUTY-VALID to CYCLE. Note, however, that this setting cannot be made if the oscillation mode is SWEEP or MODU.

ＩＭＭＥＤＣＹＣＬＥＥＸＰＡＮＤＳＹＳＴＥＭ：3ФＳＹＮＣＤＵＴＹ－ＶＡＬＩＤ 4

If DUTY-VALID is set to CYCLE, the set duty will be reflected in the subsequent cycles. Even though DUTY-VALID is set to CYCLE, extra pulses may be output if the frequency or phase is changed. Operation when DUTY-VALID: IMMED Operation when DUTY-VALID: CYCLE

The setting will be reflected at the same time that the duty changes

Duty change The setting will be reflected in the subsequent cycles

3.3 Basic operation

WF1943B 3-16

・ In squarewaves (variable duty), the duty range can be switched to 0.0000% to 100.0000% or

0.0100% to 99.9900%. To set a duty in the range from 0.0000% to 100.0000%, set DUTY-VALID to EXPAND.

ＩＭＭＥＤＣＹＣＬＥＥＸＰＡＮＤＳＹＳＴＥＭ：3ＬＯＡＤ ФＳＹＮＣＤＵＴＹ－ＶＡＬＩＤ 4

It is not possible to set CYCLE and EXPAND simultaneously. If DUTY-VALID is set to IMMED or CYCLE, the range in which the duty can be set is 0.0100% to 99.9900%. When the frequency is about 4 kHz or less, pulse losses can be prevented by restricting the duty range to 0.0100% to 99.9900%.

The waveform cannot be selected in the following cases. ・ Oscillation mode is NOISE or DC.

3.3 Basic operation

WF1943B 3-17

Frequency setting ( ENTRY → FREQ

)

Frequency (FREQ) setting is described.

Operation: Two methods can be used for setting the frequency.

(1) Keypad This method is convenient when the frequency has been determined beforehand. For example, set 1 kHz as follows.

① Press the ENTRY

key, then the FREQ

key.

Frequency

１０００．００００００００ＨｚＡ０．１０００Ｖｐ－ｐＯ＋０．００００Ｖ／ＯＰＥＮ

Amplitude DC offset

② Press the 1 key, then the k key.

If the number was entered incorrectly, press the BS key before pressing the k key.

③ After setting, press the EXIT key to exit the setting mode.

(2) Modify dial This is convenient for continuously setting the frequency.

① Press the ENTRY key, then the FREQ

key.

② Select the digit to be changed with the and keys. The selected digit flashes.

③ Turn the MODIFY

dial to set the digit.

④ After setting, press the EXIT key.

Other:

・ The frequency cannot be set in the NOISE or DC oscillation modes.

・ When keys such as k are not being used for industrial units (e.g., 50 Hz), press

the ENTER key directly after entering the frequency. “5.2 Units”, cf.

・ The frequency generating period can also be set. “5.1 Convenient Settings (Frequency [Hz] setting by period [s])”, cf.

3.3 Basic operation

WF1943B 3-18

Amplitude setting ( ENTRY → AMPTD

)

Amplitude (AMPTD) setting is described.

Operation: The amplitude can be set by two methods.

(1) Keypad

Convenient when the amplitude has been determined beforehand. For example, set 2 Vp-p as follows.

① Press the ENTRY

key, then the AMPTD

key. The following display is produced.

Amplitude

ＡＭＰＴＤ０．１０００Ｖｐーｐ１．０００００００００ｋＨｚＯ＋０．００００Ｖ／ＯＰＥＮ

Frequency DC offset

② Press the 2 key, then the ENTER key.

To correct an entry, press the BS key before pressing ENTER

key.

③ This completes setting, afterwards, press the EXIT key.

(2) Modify dial The amplitude can be changed continuously.

① Press the ENTRY

key, then the AMPTD

key.

② Select the digit to be changed with the and keys.

③ Turn theMODIFY

dial to set the flashing digit.

④ After setting, press the EXIT key to release the setting mode.

Other:

・ When the oscillation mode is DC, the amplitude cannot be set. ・ Units other than Vp-p can also be set. “5.2 Units”, cf. ・ Can also be set by waveform high level and low level.

“5.1 Convenient Settings (Amplitude and DC offset setting by high and low level)”, cf.

3.3 Basic operation

WF1943B 3-19

DC offset setting ( ENTRY → OFFSET

)

DC offset determines the offset component added to the waveform or the output voltage when the oscillation mode is DC.

Setting the DC offset (OFFSET)is described.

Operation: Two methods can be used for setting the DC offset.

(1) Keypad Convenient when the DC offset has been determined beforehand. For example, set +1 V as follows.

① Press the ENTRY

key, then the OFFSET

key.

The following display is produced.

DC offset

ＯＦＳ＋０．００００Ｖ１．０００００００００ｋＨｚＡ２．００００Ｖｐ－ｐ／ＯＰＥＮ

Frequency Amplitude

② Press the 1 key, then the ENTER key.


.


(2) Modify dial

The offset can be changed continuously.

① Press the ENTRY

key, then the OFFSET

key.


③ Turn theMODIFY



Other:

・ Can also be set by waveform high level and low level. “5.1 Convenient Settings (Amplitude and DC offset setting by high and low level)”, cf.

3.3 Basic operation

WF1943B 3-20

Phase setting ( ENTRY → PHASE

)

The oscillation starting phase setting for burst and (gated) sweep is described.

Operation: Two methods can be used for setting the phase.

(1) Keypad Convenient when the phase has been determined beforehand. For example, set 90 degrees as follows.

① Press the ENTRY key, then the PHASE

key.

The following display is produced.

Phase

ＰＨＳ０．０００ｄｅｇ１．０００００００００ｋＨｚＡ２．００００Ｖｐ－ｐ／ＯＰＥＮ

Frequency Amplitude

② Press keys 9 and 0 , then the ENTER key.


.


(2) Modify dial The phase can be changed continuously.

① Press the ENTRY key, then the PHASE

key.


③ Turn theMODIFY



3.3 Basic operation

WF1943B 3-21

Output on/off

Output on/off setting is described.

Operation:

① Press the OUTPUT

ON/OFF key. The setting alternates between on and off each time the key is pressed.

The lamp lights when on, extinguishes when off.

3.3 Basic operation

WF1943B 3-22

Operation tree

OUTPUT

ON/OFF Output on/off

MODE

Oscillation mode NORMAL

/ BURST

/ SWEEP

/ MODU

/ NOISE

/ DC

BURST

Menu

TYPE (Burst type) [BURST/TRIG/GATE/T-GATE] SOURCE (Trigger/gate source selection) DELAY (Trigger delay) * For TYPE: TRIG MARK (Number of times signal present) * For TYPE: BURST/TRIG SPACE (Number of times signal not present) * For TYPE: BURST STOP-LEVEL (Stop level)

BURST Operation

MAN TRIG

SWEEP Menu

TYPE (Sweep target) [FREQ/PHASE] SOURCE (Trigger source selection) * For MODE: SINGLE/GATED MODE (Sweep mode) [SINGLE/CONT/GATED] FUNCTION (Sweep waveform) [LIN/LOG, / / /SIN] START (Sweep start value) STOP (Sweep end value) TIME (Sweep time) STOP-LEVEL (Stop level) * For MODE: GATED CENTER (Sweep center value) SPAN (Sweep width) START-STATE (Start state) STOP-STATE (Stop state)

SWEEP Operation

START / STOP / PAUSE

3.3 Basic operation

WF1943B 3-23

MODU

Menu (Internal modulation)

TYPE (Modulation type) [FM/PM] DEVIATION (Deviation) FREQ (Modulation frequency) FUNCTION (Modulated waveform) [SIN/ / / / ]

MODU Operation

START / STOP

ENTRY Main operation

FREQ /

AMPTD /

OFFSET /

PHASE /

DUTY / WIDTH / PERIOD / HIGH / LOW

* DUTY/WIDTH for FUNCTION:

FUNCTION Waveform selection

/ / / / / ARB

/

ARB EDIT

Arbitrary waveform menu * For FUNCTION: ARB

SELECT (Select arbitrary waveform) NAME (Arbitrary waveform name) EDIT (Edit arbitrary waveform) COPY (Copy arbitrary waveform) MARK-CLEAR (Clear mark) CLEAR (Clear arbitrary waveform) SIZE (Selection of data size of arbitrary waveform)

3.3 Basic operation

WF1943B 3-24

SYSTEM

Other operation menus

RANGE (Select output range) [AUTO/10V/1V] PRESET (Initialization) USER-UNIT (User-unit menu)

TYPE (Setting target) [FREQ/PERIOD/AMPTD/OFFSET/PHASE/DUTY] NAME (Unit name) FORMULA (Formula) SCALE (Multiplier) OFFSET (Offset)

LOAD (LOAD function) φ SYNC (Phase initialization) DUTY-VALID (Duty) POWER-ON (Output state selection at power-on) REMOTE (Remote control menu)

INTERFACE (Interface) ADDRESS/ID (GPIB address/USB ID) DELIMITER (GPIB delimiter)

MEMORY Setup memory menu

STORE (Save setup memory) RECALL (Call setup memory) CLEAR (Clear setup memory)

LOCAL (Release remote state)

UNDO

(Cancel setting)

EXIT

(Move to menu immediately above)

ENTER

(Accept input value)

Numeric input (keypad)

+/- / ・ / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / M / µ / k / m / BS

Numeric modification (Modify) / /

MODIFY

WF1943B 4-1

Section 4 Applications

4.1 Burst oscillation ·········································································································4-2 Burst oscillation (Type: Burst) ···········································································4-2 Burst oscillation (Type: Trigger)········································································4-5 Burst oscillation (Type: Gate) ············································································4-9 Burst oscillation (Type: Triggered Gate)····························································4-12

4.2 Sweep ························································································································4-15 Sweep (Mode: Single)························································································4-15 Sweep (Mode: Continuous)················································································4-21 Sweep (Mode: Gated) ························································································4-25 CENTER, SPAN································································································4-32 Summary of the sweep setting items ··································································4-33 Sweep (Modulation) steps and step width ··························································4-34 Sweep value and SYNC OUT ············································································4-35

4.3 Modulation ················································································································4-36 Frequency modulation (FM) ··············································································4-36 Phase modulation (PM)······················································································4-39

4.4 Arbitrary Waveform···································································································4-42 Arbitrary waveform (ARB) ················································································4-42

4.5 Selecting waveforms of synchronous signals (SYNC OUT) ······································4-47 Procedure ···········································································································4-47 When the oscillation mode is BURST································································4-47 When the oscillation mode is SWEEP································································4-48 When the oscillation mode is MODU ································································4-48 Additional information:······················································································4-49

4.6 Output waveforms for sweeping and modulation ·······················································4-50 4.7 Equivalent noise bandwidth ·······················································································4-52

・Following is an example of the display when using this section.

Fully lighted (bold) Dimly lighted

ＢＵＲＳＴＴＲＩＧＧＡＴＥ 4 ＢＵＲＳＴ：ＴＹＰＥＭＡＲＫＳＰＡＣＥＳＴＯＰ―ＬＥＶＥＬ

Fully lighted Flashing Dimly lighted (bold)

4-2 WF1943B

4.1 Burst oscillation

Burst oscillation (Type: Burst) ( MODE →

BURST → TYPE : BURST)

Burst oscillation (Type: Burst) produces an intermittent oscillation at the designated oscillation cycle and stop cycle. Operation is described with reference to an example of producing a waveform output such as indicated in the figure. In this example, the waveform is triangular, the DC offset is set to 0 V, the oscillation start phase is set to 0 degrees, and the frequency and amplitude are set to arbitrarily defined values.

Operation: (1) Set the burst oscillation TYPE to BURST.

① Press the MODE

key, then the BURST

key.

② Use the and keys to select the type (TYPE flashes).


③ Press the ENTER key, then produce the following display with the and keys

(BURST flashes).


④ This sets the burst oscillation type to burst. Press the EXIT

key once to exit type setting.


WF1943B 4-3

(2) Set MARK cycle

① Use the and keys to produce the following display (MARK flashes).

１．０ｃｙｃｌｅＢＵＲＳＴ：ＴＹＰＥＭＡＲＫＳＰＡＣＥＳＴＯＰ―ＬＥＶＥＬ

② Press the ENTER key.

③ Set the mark cycles with the keypad orMODIFY

dial (0.5 cycles).

In this example, the setting is 2.0 cycles.

④ After setting, press the EXIT

key once to exit mark cycle setting.

(3) Set SPACE cycle

① Use the and keys to produce the following display (SPACE flashes)

１．０ｃｙｃｌｅＢＵＲＳＴ：ＴＹＰＥＭＡＲＫＳＰＡＣＥＳＴＯＰ―ＬＥＶＥＬ


③ Set the space cycles with the keypad orMODIFY

dial (0.5 cycles). In this example, the setting

is 1.5 cycles.

④ After setting, press EXIT once to exit space cycle setting.

(4) Set STOP-LEVEL

① Use the and keys to produce the following display (STOP-LEVEL flashes).

ＯＦＦＢＵＲＳＴ：ＴＹＰＥＭＡＲＫＳＰＡＣＥＳＴＯＰ―ＬＥＶＥＬ


4-4 WF1943B


Turn theMODIFY

dial to produce the following display (ON flashes).

ＯＮ０．００％ＢＵＲＳＴ：ＴＹＰＥＭＡＲＫＳＰＡＣＥＳＴＯＰ―ＬＥＶＥＬ

③ Press the key, then set the stop level with the keypad orMODIFY

dial.

In this example, the setting is 25 %.

The stop level is the percentage with respect to the maximum positive (+100 %) and negative (-100 %) amplitude.


This completes burst oscillation (type: burst) setting.

Other: • If the frequency exceeds 5 MHz, mark cycles and space cycles may be unpredictable. If the cycles are undefined, the start phase may be shifted by half a cycle even though the frequency is

set to less than 5 MHz. If such a shift occurs, set the continuous oscillation and then the burst oscillation.

• Stop level off: Oscillation stops at the phase (set by ENTRY

→ PHASE

) setting (mark cycles more

than 1.0 and mark + space cycles are integers). Waveform example of oscillation start phase:-90°, mark waves:2, space waves:1

*Also, by setting an amplitude (Vp-p) 1/2 DC offset or the low level to 0 V, a unipolar waveform can be obtained.

“5.1 Convenient Settings (Amplitude and DC offset setting by high and low level)”, cf.

• Burst oscillation setting items (BURST menu) TYPE: BURST MARK (oscillation cycle) [cycle] SPACE (cycle when oscillation stops) [cycle] STOP-LEVEL [OFF, ON[%]] PHASE (phase when oscillation starts) [deg] * ENTRY menu

Oscillation start Start phase: -90°

Oscillate 2 waves Stop 1 wave


WF1943B 4-5

Burst oscillation (Type: Trigger) ( MODE →

BURST → TYPE : TRIG)

Burst oscillation (Type: Trigger) produces an intermittent oscillation output at a designated cycle at each trigger signal. Operation is described with reference to an example of producing a waveform output such as indicated in the figure in response to an external trigger ( ).

The example is a triangular waveform, DC offset 0 V, frequency and amplitude arbitrary.

Operation: (1) Set the burst oscillation TYPE to TRIG.

① Press the MODE

key, then the BURST

key.

② Use the and keys to select the type (TYPE flashes).


③ Press the ENTER

key, then produce the following display with the and keys

(TRIG flashes).

ＢＵＲＳＴＴＲＩＧＧＡＴＥ 4 ＴＲＩＧ：ＴＹＰＥＳＯＵＲＣＥＤＥＬＡＹＭＡＲＫ 4

④ This sets the burst oscillation type to trigger. Press the EXIT

key to exit type setting.


4-6 WF1943B

(2) Select trigger SOURCE

① Use the and keys to produce the following display (SOURCE flashes).

ＥＸＴＴＲＩＧ：ＴＹＰＥＳＯＵＲＣＥＤＥＬＡＹＭＡＲＫ 4


③ Press the key, then turn theMODIFY

dial to select rising trigger ( ). ( indicates falling trigger).

④ After setting, press EXIT

once to release trigger source setting.

(3) Set DELAY time

① Use the and keys to produce the following display (DELAY flashes).

０．３μｓＴＲＩＧ：ＴＹＰＥＳＯＵＲＣＥＤＥＬＡＹＭＡＲＫ 4


③ Set the delay time with the keypad orMODIFY

dial.

For example, set to 1 ms.

④ After setting, press EXIT once to release delay time setting.


WF1943B 4-7

(4) Set MARK cycle

① Use the and keys to produce the following display (MARK flashes).

１．０ｃｙｃｌｅＴＲＩＧ：ＴＹＰＥＳＯＵＲＣＥＤＥＬＡＹＭＡＲＫ 4


Set the mark cycles with the keypad orMODIFY

dial (0.5 cycles).

In this example, the setting is 2.0 cycles.

③ After setting, press EXIT

once to release mark cycle setting.

(5) Set STOP-LEVEL


ＯＦＦＴＲＩＧ：3 ＳＴＯＰ―ＬＥＶＥＬ


Turn theMODIFY


ＯＮ０．００％ＴＲＩＧ：3 ＳＴＯＰ―ＬＥＶＥＬ


dial.

In this example, the setting is -50 %.



key to release the setting mode.


4-8 WF1943B

(6) Phase setting

① Press the ENTRY

key, then the PHASE

key

② Set the phase with the keypad orMODIFY

dial.

For example, set the phase to 90 degrees.

③ After setting, press the EXIT


The above sets burst oscillation (type: trigger). Oscillation is produced when a signal ( ) is applied

to the TRIG/SWEEP IN connector.

Additional information:

• Internal trigger : The trigger signal is produced at the rate indicated below for oscillation start/stop.

ＩＮＴ１．０００ｍｓＴＲＩＧ：ＴＹＰＥＳＯＵＲＣＥＤＥＬＡＹＭＡＲＫ 4

• Stop level off : Oscillation stops at the phase (set by ENTRY

→ PHASE

) setting (mark cycle is

integer).

• Manual trigger : Press the MAN TRIG key, then set the trigger source to EXT . Operation is

based on the logical OR of the external signal, key, and type of remote control (GPIB or USB).

• To generate the trigger signal via remote control (GPIB or USB), set the GET command or TRG command from the remote control interface. Also, set the trigger source to EXT .

For details of the remote control command, “Remote Control Instruction Manual”, cf.

• Burst oscillation (type: trigger) setting items (BURST menu) TYPE: TRIG SOURCE (trigger source) [EXT , EXT , INT [s]

DELAY (trigger delay) [s] MARK (oscillation cycle) [cycle] STOP-LEVEL [OFF, ON[%]] PHASE (phase when oscillation starts) [deg] * ENTRY menu


WF1943B 4-9

Oscillation stops at end of a half cycle,when gate signal is low level.

Burst oscillation (Type: Gate) ( MODE → BURST

→ TYPE : GATE) Burst oscillation (Type: Gate) is intermittent with start and stop according to the trigger signal level. Operation is described with reference to an example of producing a waveform output such as indicated in the figure in response to an external gate signal. The example is a triangular waveform, DC offset 0 V, oscillation start phase 0 degrees, frequency and amplitude arbitrary.

Operation: (1) Set burst oscillation TYPE to GATE.

① Press the MODE

key, then the BURST

key.

② Use the and keys to produce the following display (TYPE flashes).


③ Press the ENTER key, then produce the following display with the and keys

(GATE flashes).

ＢＵＲＳＴＴＲＩＧＧＡＴＥ 4 ＧＡＴＥ：ＴＹＰＥＳＯＵＲＣＥＳＴＯＰ－ＬＥＶＥＬ

④ This sets the burst oscillation type for gate.

Press the EXIT

key once to release the type setting mode.


4-10 WF1943B

(2) Select gate SOURCE


ＥＸＴＬ－ＯＮＧＡＴＥ：ＴＹＰＥＳＯＵＲＣＥＳＴＯＰ－ＬＥＶＥＬ


③ Press the key, then select positive logic (H-ON) with theMODIFY

dial.



(3) Set STOP-LEVEL


ＯＦＦＧＡＴＥ：ＴＹＰＥＳＯＵＲＣＥＳＴＯＰ－ＬＥＶＥＬ


Turn theMODIFY


ＯＮ０．００％ＧＡＴＥ：ＴＹＰＥＳＯＵＲＣＥＳＴＯＰ－ＬＥＶＥＬ


dial.

In this example, the setting is 0 %.




The above selects sets burst oscillation (type: gate). Oscillation occurs when a high level signal is applied to the TRIG/SWEEP IN connector. If the connection is open, oscillation continues due to internal pullup.


WF1943B 4-11

Other settings: • At the above settings, when the waveform is squarewave, a three squarewave is obtained such as

shown in the following figure.

• Internal gate source : A 50 % duty gate signal is generated at the following period for

oscillation start/stop.

ＩＮＴＨ－ＯＮ１．０００ｍｓＧＡＴＥ：ＴＹＰＥＳＯＵＲＣＥＳＴＯＰ－ＬＥＶＥＬ

• Stop level off : Oscillation stops at the half-cycle after gate signal off (i.e., at the phase set by ENTRY

→ PHASE

).

• Manual gate signal : Press the MAN TRIG key. The gate signal is on (i.e., oscillation) while the key

is pressed. In this case, set the trigger source for EXT L-ON. • To generate the trigger signal via remote control (GPIB or USB), set the TRG command from the

remote control interface. Also, set the trigger source to EXT L-ON. For details of the remote control command, “Remote Control Instruction Manual”, cf.

• Burst oscillation (type: gate) setting items (BURST menu)

TYPE: GATE SOURCE (trigger source) [EXT L-ON, EXT H-ON, INT [s] STOP-LEVEL [OFF, ON [%]] PHASE (phase when oscillation starts) [deg] * ENTRY menu

(When stop level is off, the oscillation stops at either high or low level.)


4-12 WF1943B

Burst oscillation (Type: Triggered Gate) ( MODE → BURST

→ TYPE : T-GATE)

Burst oscillation (Type: Triggered Gate) is intermittent with repeated start and stop at each trigger signal. Operation is described with reference to an example of producing a waveform output such as indicated in the figure in response to an external trigger ( ).

The example is a triangular waveform, DC offset 0 V, oscillation start phase 0 degrees, frequency and amplitude arbitrary.

Stop level : 100%

0

Trigger signal(TRIG/SWEEP IN)

Oscillation starts at trigger Oscillation stops at end of a half cycle, at nexttrigger.

Operation: (1) Set burst oscillation TYPE to trig’d gate (T-GATE)

① Press the MODE

key, then the BURST

key.

② Use the and keys to produce the following display (TYPE flashes)


③ PressENTER

key, then use the and keys to produce the following display

(T-GATE flashes).

3 Ｔ－ＧＡＴＥＴ－ＧＡＴＥ：ＴＹＰＥＳＯＵＲＣＥＳＴＯＰ―ＬＥＶＥＬ

④ This sets the burst oscillation type for triggered gate. Press the EXIT

key once to release the

type setting mode.


WF1943B 4-13

(2) Select trigger source (SOURCE)


ＥＸＴＴＲＩＧ：ＴＹＰＥＳＯＵＲＣＥＳＴＯＰ―ＬＥＶＥＬ

② Press the ENTER

key.

③ Select rising ( ) using the MODIFY

dial. ( indicates falling of the trigger signal)

④ After making a selection, press the EXIT

key once to exit the trigger source selection.

(3) Set STOP-LEVEL


ＯＦＦＴ－ＧＡＴＥ：ＴＹＰＥＳＯＵＲＣＥＳＴＯＰ―ＬＥＶＥＬ

② Press the ENTER

key.

③ Turn theMODIFY


ＯＮ０．００％Ｔ－ＧＡＴＥ：ＴＹＰＥＳＯＵＲＣＥＳＴＯＰ―ＬＥＶＥＬ

④ Press the key, then set the stop level with the keypad orMODIFY

dial. For example, set

to 100 %.

The stop level is the percentage with respect to the maximum positive (+100 %) and negative (−100 %) amplitude.

⑤ After setting, press the EXIT


The above sets the burst oscillation (type: triggered gate). Oscillation alternates between start and stop each time a signal ( ) is applied to the TRIG/SWEEP IN connector.


4-14 WF1943B

Other settings:

• Stop level off : Oscillation stops after the trigger signal is applied, at the end of a half cycle (i.e., at

the phase set by ENTRY

→ PHASE

) or plus 180 degrees from that phase.

• Manual trigger : When a manual trigger signal is desired, press the

MAN TRIG key. Oscillation

starts and stops each time the key is pressed.

However, produce the manual trigger signal after the oscillation has stopped. If oscillation is from an external signal, oscillation will not stop even if the

MAN TRIG

key is pressed. Oscillation stops during power-on.

• To generate the trigger signal via remote control (GPIB or USB), set the GET command or TRG

command from the remote control interface. Also, set the trigger source to EXT .

For details of the remote control command, “Remote Control Instruction Manual”, cf.

• Burst oscillation (type: triggered gate) setting items (BURST menu) TYPE: T-GATE SOURCE (trigger source) [ EXT , EXT ]

STOP-LEVEL [OFF, ON[%]] PHASE (phase when oscillation starts) * ENTRY menu

WF1943B 4-15

4.2 Sweep

Sweep (Mode: Single) ( MODE → SWEEP

→ MODE : SINGLE)

In a Sweep (Mode: Single), oscillation occurs by varying parameters such as the frequency and amplitude one time between the start and stop settings. Oscillation continues after the sweep is completed. Operation to produce a waveform output with frequency that varies linearly and continuously is described. The setting example is a sinewave with arbitrary amplitude and DC offset.

Operation: (1) Set sweep MODE to SINGLE

① Press the MODE

key, then the SWEEP

key.

② Use the and keys to produce the following display (MODE flashes).

ＳＩＮＧＬＥＣＯＮＴＧＡＴＥＤＦ－ＳＷＰ：ＴＹＰＥＳＯＵＲＣＥＭＯＤＥ 4

③ Press ENTER

, then use the and keys to produce the following display

(SINGLE flashes).


④ This sets the sweep mode for single. Press the EXIT

key once to release mode select.

4.2 Sweep

4-16 WF1943B

(2) Set the sweep TYPE to FREQ

① Use the and keys to produce the following display (TYPE flashes).

ＦＲＥＱＰＨＡＳＥＦ－ＳＷＰ：ＴＹＰＥＳＯＵＲＣＥＭＯＤＥ 4

② Press ENTER key, then use the and keys to produce the following display

(FREQ flashes).


③ This sets the sweep type for frequency. Press the EXIT

key once to release the type setting mode.

(3) Select sweep FUNCTION

① Use the and keys to produce the following display (FUNCTION flashes).

ＬＩＮＦ－ＳＷＰ：3 ＦＵＮＣＴＩＯＮＳＴＡＲＴＳＴＯＰ 4


③ Press the key, then select with theMODIFY

dial.

④ After selecting, press the EXIT key once to release the function select mode.

4.2 Sweep

WF1943B 4-17

(4) Set START frequency

① Use the and keys to produce the following display (START flashes).

１０００．００００００００ＨｚＦ－ＳＷＰ：3 ＦＵＮＣＴＩＯＮＳＴＡＲＴＳＴＯＰ 4

② Press ENTER key.

③ Set the start frequency with the keypad orMODIFY

dial.

For example, set to 100 Hz.


key once to release the start frequency setting mode.

(5) Set STOP frequency

① Use the and keys to produce the following display (STOP flashes).

１００００．００００００００ＨｚＦ－ＳＷＰ：3 ＦＵＮＣＴＩＯＮＳＴＡＲＴＳＴＯＰ 4


③ Set the stop frequency with the keypad orMODIFY

dial.



key once to release the stop frequency setting mode.

4.2 Sweep

4-18 WF1943B

(6) Set sweep TIME

① Use the and keys to produce the following display (TIME flashes).

１．０００ｓＦ－ＳＷＰ：3 ＴＩＭＥＣＥＮＴＥＲＳＰＡＮ 4


③ Set the sweep time with the keypad orMODIFY

dial.

For example, set to 3 seconds.

④ After setting, press the EXIT key once to release the sweep time setting mode.

(7) Sweep operation

① Sweep starts when the

START key is pressed.

When sweep is started, an existing output frequency is quickly changed to the start frequency. If

desiring to set the start frequency output beforehand, press the STOP key.

The output quickly changes to the start frequency, then sweeps to the stop frequency in 3 seconds (in this example). Oscillation then continues at the stop frequency.

When the START key is again pressed, sweep begins at the stop frequency and ends at the start

frequency.

4.2 Sweep

WF1943B 4-19

Other operations:

• Sweep stop : Press the STOP key. When sweep is stopped at the stop value at single sweep end

or during sweep, press the STOP key to set the start value. (Same operation as the

START-STATE described subsequently in this section)

• Sweep pause : Press the PAUSE key. Again press the

PAUSE key to resume sweep.

• Single sweep operation examples

• Dead time and trigger delay : Triggers input within 100 ms of completion of the last sweep are ignored. The trigger delay for the first sweep after power-on or a parameter change is 40 ms.

Otherwise, it is 2 ms. Power-on or a sweep parametersetting change Stop value

Dead time = 100 ms

Start value

TriggerTrigger Triggers during deadtime are ignored.

40ms 2ms

• External sweep start : Set the sweep trigger source to EXT and select rising or falling. Supply an external signal to the front panel TRIG/SWEEP IN connector. However, note that retrigger cannot be applied for 100 ms after sweep start. During a sweep, the sweep restarts if a trigger is input.

ＥＸＴＦ－ＳＷＰ：ＴＹＰＥＳＯＵＲＣＥＭＯＤＥ 4

4.2 Sweep

4-20 WF1943B

• FUNCTION determines the sweep type. : For example, provides step-type change of output (e.g., frequency) at the sweep time halfway

point. LIN/LOG provides linear or logarithmic variation of the output with respect to the time axis.

i

i

i

iSIN ( )

LIN

LOG

LIN

LOG

LIN

LOG

• Internal sweep trigger source : The trigger signal is generated at the following rate, then sweep is conducted. However, the trigger interval is 100 ms even if set to less.

ＩＮＴ１００．０ｍｓＦ－ＳＷＰ：ＴＹＰＥＳＯＵＲＣＥＭＯＤＥ 4

• START-STATE and STOP-STATE : Respectively set the output to start and stop values. Since the sweep synchronization output becomes the respective start and stop states, the state of external equipment can be checked. The Start-State is the same as pressing the

STOP key (during single sweep).

Relationship between sweep values and sweep synchronization output,


• To generate the trigger signal via remote control (GPIB or USB), set the GET command or TRG

command from the remote control interface. For details of the remote control command, “Remote Control Instruction Manual”, cf.

Trigger rate

4.2 Sweep

WF1943B 4-21

Sweep (Mode: Continuous) ( MODE → SWEEP

→ MODE : CONT)

In a Sweep (Mode: Continuous), oscillation occurs by varying parameters such as the frequency and amplitude continuously between the start and stop settings. Operation is described for producing a waveform output with linear and continuously frequency. The waveform is a sinewave with arbitrary Amplitude and DC offset.

Operation: (1) Set sweep MODE to continuous (CONT)

① Press the MODE

key, then the SWEEP

key.



③ Press the ENTER key, then use the and keys to produce the following display

(CONT flashes).

ＳＩＮＧＬＥＣＯＮＴＧＡＴＥＤＦ－ＳＷＰ：ＴＹＰＥＭＯＤＥＦＵＮＣＴＩＯＮＳＴＡＲＴ 4

④ This completes setting the sweep mode to continuous. Press theEXIT


setting mode.

4.2 Sweep

4-22 WF1943B

(2) Set sweep TYPE to frequency (FREQ)


ＦＲＥＱＰＨＡＳＥＦ－ＳＷＰ：ＴＹＰＥＭＯＤＥＦＵＮＣＴＩＯＮＳＴＡＲＴ 4

② Press the ENTER key, then use the and keys to produce the following display

(FREQ flashes).

ＦＲＥＱＰＨＡＳＥＦ－ＳＷＰ：ＴＹＰＥＭＯＤＥＦＵＮＣＴＩＯＮＳＴＡＲＴ 4

③ This completes setting the sweep type to frequency. Press the EXIT


setting mode.

(3) Select the sweep FUNCTION


ＬＩＮＦ－ＳＷＰ：ＴＹＰＥＭＯＤＥＦＵＮＣＴＩＯＮＳＴＡＲＴ 4



dial to select .

④ After selecting, press the EXIT

key once to release the function select mode.

4.2 Sweep

WF1943B 4-23

(4) Set the START frequency (START)


１０００．００００００００ＨｚＦ－ＳＷＰ：ＴＹＰＥＭＯＤＥＦＵＮＣＴＩＯＮＳＴＡＲＴ 4


③ Set the start frequency with the key pad orMODIFY

dial.



key once to release the start setting mode.

(5) Set the STOP frequency (STOP)


１０００．００００００００ＨｚＦ－ＳＷＰ：3 ＳＴＯＰＴＩＭＥＣＥＮＴＥＲＳＰＡＮ 4


③ Set the stop frequency with the key pad orMODIFY

dial.



key once to release the stop setting mode.

(6) Set the sweep TIME


１．０００ｓＦ－ＳＷＰ：3 ＳＴＯＰＴＩＭＥＣＥＮＴＥＲＳＰＡＮ 4


③ Set the sweep time with the key pad orMODIFY

dial.



key once to release the sweep time setting mode.

4.2 Sweep

4-24 WF1943B

(7) Sweep operation

① Press the

START key, then sweep starts.

The output quickly changes to the sweep start frequency.

If desiring to set the start frequency output beforehand, press the STOP key.

Pressing the START a sweep restarts the sweep.

Other operations:

• Sweep stop : Press the STOP key. This becomes the sweep start value.

• Sweep pause : Press the PAUSE key. To resume sweep, again press the

PAUSE key.

• FUNCTION : The function determines the sweep type. For example, provides step-type

change of output (e.g., frequency) at the sweep time halfway point. LIN/LOG provides linear or logarithmic variation of the output with respect to the time axis.

i

i

i

iSIN ( )

LIN

LOG

LIN

LOG

LIN

LOG

• START-STATE and STOP-STATE : Set output to start and stop values, respectively. Since sweep synchronization output becomes the respective start and stop states, full-scale adjustments of the recorder and the status of external equipment can be checked. START-STATE is the

same as pressing the STOP key (during a continuous sweep).

Relationship between sweep values and sweep synchronization output,


4.2 Sweep

WF1943B 4-25

Sweep (Mode: Gated) ( MODE → SWEEP

→ MODE : GATED)

In a Sweep (Mode: Gated), oscillation occurs by varying parameters such as the frequency and amplitude one time between the start and stop settings. Oscillation stops before the sweep starts and when the sweep is completed. Operation to produce a waveform output with frequency that varies in step form and oscillation stops is described. The setting example is a sinewave with arbitrary amplitude and DC offset 0.

Operation: (1) Set sweep MODE to GATED

① Press the MODE

key, then the SWEEP

key.



③ Press the ENTER key, then use the and keys to produce the following display

(GATED flashes).


④ This completes setting the sweep mode to gated. Press the EXIT

key once to release the setting

mode.

4.2 Sweep

4-26 WF1943B

(2) Set sweep TYPE to FREQ



② Press the ENTER key, then use the and keys to produce the following display (FREQ

flashes).


③ This completes setting the sweep type to frequency. Press the EXIT


setting mode.

(3) Select the sweep FUNCTION


ＬＩＮＦ－ＳＷＰ：3 ＦＵＮＣＴＩＯＮＳＴＡＲＴＳＴＯＰ 4


③ Press the key, then select with theMODIFY

dial

④ After selecting, press the EXIT

key once to release the function select mode.

4.2 Sweep

WF1943B 4-27

(4) Set the START frequency


１０００．００００００００ＨｚＦ－ＳＷＰ：3 ＦＵＮＣＴＩＯＮＳＴＡＲＴＳＴＯＰ 4


③ Set the frequency with the keypad orMODIFY

dial.



key once to release the start frequency setting mode.

(5) Set the STOP frequency


１００００．００００００００ＨｚＦ－ＳＷＰ：3 ＦＵＮＣＴＩＯＮＳＴＡＲＴＳＴＯＰ 4



dial.



key once to release the stop frequency setting mode.

4.2 Sweep

4-28 WF1943B

(6) Set the sweep TIME


１．０００ｓＦ－ＳＷＰ：3 ＴＩＭＥＳＴＯＰ－ＬＥＶＥＬＣＥＮＴＥＲ 4


③ Set the sweep time with the keypad orMODIFY

dial.



key once to release the sweep time setting mode.

(7) Set the STOP-LEVEL


ＯＦＦＦ－ＳＷＰ：3 ＴＩＭＥＳＴＯＰ－ＬＥＶＥＬＣＥＮＴＥＲ 4


③ Turn theMODIFY


ＯＮ０．００％Ｆ－ＳＷＰ：3 ＴＩＭＥＳＴＯＰ－ＬＥＶＥＬＣＥＮＴＥＲ 4

④ Press the key, then set the stop level with the keypad orMODIFY

dial. For example, set to

50 %.

The stop level is a percentage with respect to the maximum positive and negative amplitudes taken respectively as +100 % and -100 %.

⑤ After setting, press the EXIT

key to exit stop level setting.

4.2 Sweep

WF1943B 4-29

(8) Start sweep

① Press the

START key.

In this example, sweep ends after 3 seconds and oscillation stops. Again press the

START key to

sweep from the stop to the start frequency.

4.2 Sweep

4-30 WF1943B

Other operations:

• Sweep stop : Press the STOP key. Oscillation stops. When sweep is stopped at gated sweep

end or during sweep, press the STOP key to set the start value. (Oscillation stops)

• Sweep pause : Press the PAUSE key. To resume sweep, again press the

PAUSE key.

• Gated sweep operation examples

• External start :Change the sweep trigger source to EXT and select rising or falling. Supply an external signal to the front panel TRIG/SWEEP IN connector. Observe that retrigger is not accepted for 100 ms after sweep start. If a trigger is input during the sweep, the sweep restarts.

ＥＸＴＦ－ＳＷＰ：ＴＹＰＥＳＯＵＲＣＥＭＯＤＥ 4

• FUNCTION : The function determines the sweep type. For example, provides step-type

change of output (e.g., frequency) at the sweep time halfway point. LIN/LOG provides linear or logarithmic variation of the output with respect to the time axis.

i

i

i

iSIN ( )

LIN

LOG

LIN

LOG

LIN

LOG

4.2 Sweep

WF1943B 4-31

• Internal trigger source : The internal trigger signal is produced at the rate indicated below. Even is set to

less than 100 ms, the trigger is applied only at 100 ms intervals.

ＩＮＴ１００．０ｍｓＦ－ＳＷＰ：ＴＹＰＥＳＯＵＲＣＥＭＯＤＥ 4

• START-STATE and STOP-STATE : Set output to start and stop values, respectively. Both START-STATE and STOP-STATE oscillation can be

conducted together with a gated sweep. Since sweep synchronization output becomes the respective start and stop states, full-scale adjustments of the recorder and the status of external equipment can be checked.

Relationship between sweep values and sweep synchronization

output,


• If the frequency is low and the sweep rest period short, in some cases, oscillation may not stop

immediately at the end of sweep.

Trigger rate

4.2 Sweep

4-32 WF1943B

CENTER, SPAN

• Center is the sweep center value, while span is the range setting. The relationship among center, span, start and stop is as follows. Values cannot be entered for CENTER and SPAN, however, if the sweep type is set from a user unit that has the log function.

• When start is changed: Stop does not change. CENTER = (START+STOP) ÷ 2 SPAN = |START−STOP|

• When stop is changed: Start does not change. CENTER = (START + STOP) ÷ 2 SPAN = |START − STOP|

• When center is changed: Span does not change. START = CENTER −/+ (SPAN ÷ 2) STOP = CENTER +/− (SPAN ÷ 2) • When span is changed: Center does not change. START = CENTER − /+ (SPAN ÷ 2) STOP = CENTER +/− (SPAN ÷ 2)

4.2 Sweep

WF1943B 4-33

Summary of the sweep setting items

• The following summarizes the items that need to be set during a sweep operation (in the SWEEP menu).

TYPE (sweep target) [FREQ, PHASE] SOURCE (trigger source) [EXT , EXT , INT [s]

* Set when the sweep mode is SINGLE or GATED MODE (sweep mode) [SINGLE, CONT, GATED] FUNCTION (sweep waveform) [LIN , LOG , , LIN SIN, LOG SIN, LIN , LOG ]

START (sweep start value)/STOP (sweep stop value) or Sweep range setting CENTER (sweep center value)/SPAN (sweep width) TIME (sweep time) [s] STOP-LEVEL

Set when the sweep mode is GATED PHASE (phase when oscillation starts) * ENTRY menu

• Sweep operations

• Main operation

START (sweep start) STOP (sweep end/sweep start state) *For subsequent operation when the sweep has been completed, the state is reset to the sweep start state. PAUSE (sweep pause/restart)

• In the SWEEP menu START-STATE (sweep start state) STOP-STATE (sweep stop state)

4.2 Sweep

4-34 WF1943B

Sweep (Modulation) steps and step width

Sweep and modulation outputs are changed by software. Methods for estimating sweep, modulation step number (number of output changes between start and stop values) and step width (variation width per change) are indicated below. Sweep is described here. For modulation, replace sweep function with modulation waveform, sweep type with modulation type, and sweep time with modulation period, respectively. The modulation period is determined as follows.

When the waveform is SIN, , , : Modulation period = 1 ÷ (Modulation frequency × 2) When the waveform is , : Modulation period = 1 ÷ Modulation frequency

• Step number derivation (1) Sweep function is step ( ):

Step number = Sweep time [s] × 10000 (raise up, even number *1) (2) Sweep function is other than step and sweep type is frequency:

① Sweep time is 25 ms and below:

Step number = Sweep time [s] × 10000 ② Sweep time is more than 25 to 31.25 ms and below:

Step number = 250 (fixed) ③ Sweep time is more than 31.25 ms:

Step number = Sweep time [s] × 8000 (3) Sweep function is other than step and sweep type is other than frequency:

① Sweep time is 50 ms and below:

Step number = Sweep time [s] × 10000 ② Sweep time is more than 50 to 62.5 ms and below:

Step number = 250 (fixed) ③ Sweep time is more than 62.5 ms:

Step number = Sweep time [s] × 8000

*1: If raising up results in odd number, -1.

• Deriving step width

During linear sweep, step width = ―――――――

During logarithmic sweep, step width = log10

-1 [log10 ――― ÷ (step no. -1)]

Step width during log sweep changes with step progression.

Span Step number -1

stop start

4.2 Sweep

WF1943B 4-35

Sweep value and SYNC OUT

Approximately 100 to 125 µs

4-36 WF1943B

4.3 Modulation

Frequency modulation (FM) ( MODE

→ MODU → TYPE : FM)

Operation to produce a frequency modulated waveform output is described. The example is a sinewave, 1 kHz, amplitude and DC offset arbitrary.

Operation: (1) Set modulation TYPE to frequency (FM)

① Press the MODE

key, then the MODU

key.


ＦＭＰＭＦＭ：ＴＹＰＥＤＥＶＩＡＴＩＯＮＦＲＥＱＦＵＮＣＴＩＯＮ

③ Press the ENTER key, then use the and keys to produce the following display (FM

flashes).


④ This sets the modulation type for frequency. Press the EXIT

key once to release the type setting

mode.

4.3 Modulation

WF1943B 4-37

(2) Set the frequency DEVIATION

① Use the and keys to produce the following display (DEVIATION flashes).

１０００．００００００００ＨｚＦＭ：ＴＹＰＥＤＥＶＩＡＴＩＯＮＦＲＥＱＦＵＮＣＴＩＯＮ


③ Set the deviation with the keypad orMODIFY

dial.


④ After setting, press the EXIT key once to exit frequency deviation setting.

(3) Set the modulation FREQ

① Use the and keys to produce the following display (FREQ flashes).

１００．００ＨｚＦＭ：ＴＹＰＥＤＥＶＩＡＴＩＯＮＦＲＥＱＦＵＮＣＴＩＯＮ



dial.

For example, set to 50 Hz (20 ms).

④ After setting, press the EXIT key once to release the modulation setting mode.

(4) Select the modulation waveform (FUNCTION)


ＳＩＮＦＭ：ＴＹＰＥＤＥＶＩＡＴＩＯＮＦＲＥＱＦＵＮＣＴＩＯＮ

4.3 Modulation

4-38 WF1943B

② Press the ENTER key, then use the and keys to produce the following display (SIN

flashes).

ＳＩＮＦＭ：ＴＹＰＥＤＥＶＩＡＴＩＯＮＦＲＥＱＦＵＮＣＴＩＯＮ

③ After making a selection, press the EXIT

key to exit function setting.

The above completes frequency modulation setting.

Other operations:

• When the oscillation mode is changed to modulation (MODU), modulation occurs at the setting at that

time point.

To stop modulation: Press the STOP key. Resume modulation by pressing the

START key.

• Setting items at frequency modulation (MODU menu)

TYPE: FM DEVIATION (frequency deviation) [Hz] FREQ (modulation frequency) [Hz] FUNCTION (modulation waveform) [SIN, ,

, , ]

4.3 Modulation

WF1943B 4-39

Phase modulation (PM) ( MODE → MODU

→ TYPE : PM)

Operation to produce a phase modulated waveform output is described below. In this example, the waveform is triangular, the 1 kHz, DC offset is set to 0 V, the oscillation start phase is set to 0 degrees, and the frequency and amplitude are set to arbitrarily defined values.

Operation: (1) Set modulation TYPE to phase (PM)

① Press the MODE

key, then the MODU

key.



③ Press the ENTER key, then use the and keys to produce the following display (PM

flashes).

ＦＭＰＭＰＭ：ＴＹＰＥＤＥＶＩＡＴＩＯＮＦＲＥＱＦＵＮＣＴＩＯＮ

④ This sets the modulation type for phase. Press the EXIT

key once to release the type setting

mode.

4.3 Modulation

4-40 WF1943B

(2) Set the phase DEVIATION

① Use the and keys to produce the following display (DEVIATION flashes).

９０．０００ｄｅｇＰＭ：ＴＹＰＥＤＥＶＩＡＴＩＯＮＦＲＥＱＦＵＮＣＴＩＯＮ


③ Set the deviation with the keypad orMODIFY

dial.

For example, set to 45 degrees.

④ After setting, press the EXIT key once to release the phase deviation setting mode.

(3) Set the modulation FREQ (frequency with varying phase)

① Use the and keys to produce the following display (FREQ flashes).

１００．００ＨｚＰＭ：ＴＹＰＥＤＥＶＩＡＴＩＯＮＦＲＥＱＦＵＮＣＴＩＯＮ



dial.

For example, set to 200 Hz (5 ms).

④ After setting, press the EXIT key once to release the modulation frequency setting mode.

(4) Select the modulation waveform (FUNCTION)


ＳＩＮＰＭ：ＴＹＰＥＤＥＶＩＡＴＩＯＮＦＲＥＱＦＵＮＣＴＩＯＮ

4.3 Modulation

WF1943B 4-41


( flashes).

ＳＩＮＰＭ：ＴＹＰＥＤＥＶＩＡＴＩＯＮＦＲＥＱＦＵＮＣＴＩＯＮ

③ After selecting, press the EXIT key to release the function setting mode.

The above completes phase modulation setting.

Other operations:

• When the oscillation mode is changed to modulation (MODU), modulation occurs at the setting at that

time point.

To stop modulation : Press the STOP key. Resume modulation by pressing the

START key.

• Setting items at phase modulation (MODU menu)

TYPE: PM DEVIATION (phase deviation) [deg] FREQ (modulation frequency) [Hz] FUNCTION (modulation waveform) [SIN, ,

, , ]

4-42 WF1943B

4.4 Arbitrary Waveform

Arbitrary waveform (ARB) ( FUNCTION

→ ARB )

Operation using arbitrary waveform (ARB) to produce a sinewave with clipped peak output is described.

Operation: (1) Set waveform to arbitrary (ARB)

① Press the FUNCTION key, then the ARB

key.

(2) Select an arbitrary waveform to be edited/output (SELECT).

① Press the ARB EDIT key, then use the and keys to produce the following display

(SELECT flashes).

０：ＡＲＢ＿００１：ＡＲＢ＿０１ 4 ＡＲＢ：ＳＥＬＥＣＴＮＡＭＥＥＤＩＴＣＯＰＹ 4


(1:ARB_01 flashes).

０：ＡＲＢ＿００１：ＡＲＢ＿０１ 4 ＡＲＢ：ＳＥＬＥＣＴＮＡＭＥＥＤＩＴＣＯＰＹ 4

③ This completes the selection of an arbitrary waveform (No. 1 is selected here). Press the EXIT

key one time to release the arbitrary waveform selection mode.

Waveform data

Waveform data


WF1943B 4-43

(3) Copy the waveform, for example, sinewave

① Press the ARB EDIT

key, then use the and keys to produce the following display (COPY

flashes).

ＳＩＮＡＲＢ：ＳＥＬＥＣＴＮＡＭＥＥＤＩＴＣＯＰＹ 4

② Press ENTER key, then use the and keys to produce the following display (SIN

flashes).

ＳＩＮＡＲＢ：ＳＥＬＥＣＴＮＡＭＥＥＤＩＴＣＯＰＹ 4

③ Press ENTER key to copy the sinewave.


4-44 WF1943B

(4) Edit the waveform, for example, peak clip

① Use the and keys to produce the following display (EDIT flashes).

Waveform address Waveform data

ＡＤ：００００ＤＴ：＋０００００ＡＲＢ：ＳＥＬＥＣＴＮＡＭＥＥＤＩＴＣＯＰＹ 4

② Press ENTER key, then the key (AD digit flashes).

ＡＤ：００００ＤＴ：＋０００００ＡＲＢ：ＳＥＬＥＣＴＮＡＭＥＥＤＩＴＣＯＰＹ 4

③ Set the waveform address (AD) with the keypad orMODIFY

dial.

For example, set to 1024.

④ Press the m key to produce the following display (the asterisk (*) is displayed).

ＡＤ：１０２４ＤＴ：＋２３１７０＊ＡＲＢ：ＳＥＬＥＣＴＮＡＭＥＥＤＩＴＣＯＰＹ 4

* is interpolation type mark and indicates the linear interpolation type address. The mark appears and

extinguishes each time the m key is pressed.

⑤ Next, use above steps ③ and ④ to set the interpolation mark (*) to waveform address 3072.


WF1943B 4-45

⑥ Press the k key for linear interpolation. In this example, the first half of the sinewave is

clipped ( ). The waveform data (DT) change as a result of linear interpolation between the

starred addresses.

⑦ Press the EXIT

key, then use the and keys to produce the following display

(MARK-CLEAR flashes).

１：ＡＲＢ＿０１ＡＲＢ：3 ＭＡＲＫ－ＣＬＥＡＲＣＬＥＡＲＳＩＺＥ

Press the ENTER key twice to clear the interpolation marks from addresses 1024 and 3072.

⑧ In the same manner as above steps ① to ⑥, clip the first half of a sinewave (set interpolation

marks at 5120 and 7168).

The above completes arbitrary waveform setting.


4-46 WF1943B

Other operations:

• Arbitrary waveform data input: ARB EDIT

→ EDIT select → ENTER

→ flashes the

waveform data (DT) digits. Use the keypad orMODIFY

dial to set the data.

Data upper and lower limits are +32767 and −32768, which correspond to the amplitude peak-to-peak

settings. For this reason, when the waveform vertical limits are changed by the above type of

method, the amplitude setting (Vp-p) and the actual output waveform Vp-p do not coincide. The

data set addresses are automatically the linear interpolation addresses (the * mark is displayed).

• Clear (to 0) waveform data: ARB EDIT → CLEAR select → ENTER

, then again

press ENTER . The interpolation marks (*) are

also cleared.

• Apply a name to an arbitrary waveform: ARB EDIT → NAME select → ENTER

, then use the MODIFY

dial to select the characters. Shift

position with and , and input.

Up to 8 characters can be input. Following are the usable characters.

a b c d e f g h i j k l m n o p q r s t u v w x y z ( s p a c e )

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0 1 2 3 4 5 6 7 8 9 ! ” # $ % & ’ ( ) * + , − . / : ; < = > ? @ [ ¥ ] ^ _ ` | → ←

• Change the waveform data size: ARB EDIT → SIZE select → ENTER

→ Use and to select the data size

Relat ion between the waveform data s ize and number of waveforms

Data s i ze Waveform number Number o fwaveforms

8k(8192) 0 1 2 3 4 5 6 7 8 9 10 11 12

16K(16384) 0 1 2 3 4 5 6

32K(32768) 0 1 2 3

64K(65536) 0 1

The output waveform changes as described below when the waveform data size is changed. If, for example, the waveform data size is changed from 16 KB to 8 KB when there is a waveform like for waveform number 0, is assigned to waveform number 0 and to waveform

number 1.

WF1943B 4-47

4.5 Selecting waveforms of synchronous signals (SYNC OUT)

This section describes the switching of SYNC OUT waveforms.

Procedure

① Press the SYSTEM key, then use the and keys to produce the following display

(The lower SYNC OUT flashes).

ＳＴＡＴＥ：ＰＨＡＳＥＳＹＳＴＥＭ：3 ＳＹＮＣＯＵＴＰＯＷＥＲ－ＯＮＲＥＭＯＴＥ

② Press the ENTER key, then use the and keys to set the SYNC OUT waveform.

③ After setting, press the EXIT key to release the SYNC OUT waveform setting mode.

When the oscillation mode is BURST

• STATE: Low level during oscillation. High level while stopped. • PHASE: For squarewaves (variable duty), the same waveform as that for FUNCTION OUT.

For other cases, high level while between 0 and 180 degrees of the waveform in the oscillation period, and low level while between 180 and 360 degrees.

Oscillating

Stopped

FUNCTION OUT

SYNC OUTSYNC OUT: STATE

SYNC OUTSYNC OUT: PHASE

4.5 Output waveforms for sweeping and modulation

4-48 WF1943B

When the oscillation mode is SWEEP

• STATE: Low level while sweeping from the start value to the stop value or stopped. Otherwise,

high level. • PHASE: PHASE: For squarewaves (variable duty), the same waveform as that for

FUNCTION OUT. Otherwise, high level while between 0 and 180 degrees of the waveform, and low level while between 180 and 360 degrees.

Sweeping

FUNCTION OUT



When the oscillation mode is MODU

• STATE: STATE: Low level while executing modulation and between 180 and 360 degrees of the modulated waves. Otherwise, high level.

• PHASE: PHASE: For squarewaves (variable duty), the same waveform as that for

FUNCTION OUT. Otherwise, high level while between 0 and 180 degrees of the modulated waves, and low level while between 180 and 360 degrees.

Modulation execution

FUNCTION OUT



4.5 Switching waveforms of synchronous signals (SYNC OUT)

WF1943B 4-49

Additional information:

• For and (fixed duty) at frequencies over 100 kHz, if SYNC OUT is set to PHASE, output becomes the waveform which applied the analog signal of a sinewave to the comparator. For this reason, the output level (high or low) may be undefined at 0, 180, and 360 degrees (±2 degrees, approximately). In particular, note that when the oscillation mode is switched during a burst or gated sweep while oscillation is stopped, the output level may vary or the waveform may become glitch-shaped. If a precise output level is required while oscillation is stopped, shift the phase setting. For example, setting the phase at + 90 degrees shifts the output level to the high level while oscillation is stopped.

0° 180° 360° (=0°)

Approximately±2 degrees

Phase(ideal value)

SYNC OUT

The shaded sectionsrepresent an undefinedoutput level.

4-50 WF1943B


The setup values for sweeping and modulation are updated every 100 to 252 µs. Thus, if the sweep time is short or the modulation frequency is high, the amount of change for updating increases, leading to marked discontinuities. If the sweep function (modulated waves) is

, , or , discontinuities become conspicuous in some of the stepwise variations. Since the setup values vary enormously in some of the stepwise variations, discontinuities are generated. If such discontinuities are removed, the remaining variations have the appearance shown below. If, as an extreme example, the oscillation frequency is 1 kHz, the sweep time is 4 ms, the start phase is 180 degrees, the stop phase is -180 degrees, and the sweep function is in the phase sweep, the phase shifts about 26 degrees every 100 µs, producing the following output waveforms. Discontinuities are generated not only by , but also by , , and .

Since the phase changes at intervalsof 100 to 252 µs, discontinuities aregenerated The phase is swept Waveform when swept

Waveform when not sweptUpdate interval 100 to 252 µs


WF1943B 4-51

Since the squarewaves (fixed duty) and squarewaves (variable duty) are generated differently

from other waveforms, extra pulses are produced. Similarly, extra pulses are also produced by phase modulation, duty sweep, and PWM.

Update interval 100 to 252 µs

If the sweep function (FUNCTION)is triangular and the change rate ofphase is large

Output waveform

Extra pulses are produced The occurrence frequency when the sweep function is , , or is roughly given by the following formula: If, for example, the frequency is 1 kHz, the phase span is 90 degrees, and the sweep time is 100 ms, an extra pulse is generated every 400 cycles on average.

Occurrence frequency [%]= × 100 360 × oscillation frequency [Hz] × sweep time [s]

phase span [deg]

4-52 WF1943B

4.7 Equivalent noise bandwidth

The density of noise generated by the WF1943B is as shown in the following figure (a) "Frequency characteristics of noise generated by the WF1943B." The effective values (rms) of (a) are equal to those of white noise in the figure (b) "Frequency characteristics of white noise," that follows. This equivalent bandwidth (500 kHz) is called the equivalent noise bandwidth.

Noise density [V/ Hz ]

About 320 kHz -3dB

(a) Frequency characteristics of noise generated by the WF1943B

(b) Frequency characteristics of white noise

500kHz

Noise density [V/ Hz ]

Frequency

Frequency

Effective values are equal

WF1943B 5-1

Section 5 Other Operations

5.1 Convenient Settings ···································································································5-2

Frequency [Hz] setting by period [s] ··································································5-2 Squarewave duty setting ····················································································5-3 Squarewave pulse width setting ·········································································5-4 Amplitude and DC offset setting by high and low level ·····································5-5

5.2 Units ··························································································································5-7 Engineering unit (µ, m, k, M) display ································································5-7 Amplitude units change ·····················································································5-8 User-unit setting·································································································5-9

5.3 Setting memory··········································································································5-13 Setting store ·······································································································5-13 Setting recall ······································································································5-14 Setting memory clear ·························································································5-15

5.4 Other settings·············································································································5-16 Output range change (use with fixed range) ·······················································5-16 Output on/off at power on ··················································································5-17 LOAD function (equalize setting and output values) ·········································5-18 UNDO function··································································································5-19 Pulse generator function·····················································································5-20 Phase initialization ·····························································································5-22

・Following is a typical example of the display panel indications used in this Section.

Fully lighted(bold) Dimly lighted

ＦＲＥＱＰＥＲＩＯＤＡＭＰＴＤ 4 ＵＳＥＲＵＮＩＴ：ＴＹＰＥＮＡＭＥＦＯＲＭＵＲＡ 4

Fully lighted(bold) Flashing Dimly lighted

5-2 WF1943B

5.1 Convenient Settings

Frequency [Hz] setting by period [s] ( ENTRY →

PERIOD )

Operation is described for setting the waveform repetition rate not in frequency (Hz) but as period (s).

Operation:

① Press the ENTRY key, then the

PERIOD key to produce the following display.

Ｐ０．００１０００００００００ｓＡ０．１０００Ｖｐ－ｐＯ＋０．００００Ｖ／ＯＰＥＮ

② Set the period with the keypad orMODIFY

dial.

Other:

The period setting is frequency with the reciprocal less than 0.01 µHz, the number should be rounded off. Thus, the setting tolerance is large when the frequency setting digits are fewer (period longer).

In this situation, even if setting is changed by the keypad or MODIFY

dial, the actual oscillation period

does not change in some cases.


WF1943B 5-3

Squarewave duty setting ( ENTRY → DUTY )

Operation to set the squarewave duty is described. The setting changes the width (%) of the pulse with

respect to the overall waveform (

portion indicated by arrows).

Select squarewave ( variable duty).

Operation:

① Press the ENTRY key, then the DUTY

key to produce the following display.

ＤＵＴＹ５０．００００％１０００．０００００００ＨｚＡ０．１０００Ｖｐ－ｐ／ＯＰＥＮ

② Set the duty with the keypad orMODIFY

dial.

Other:

• The table indicates the effects on other parameters when the frequency, period, width or duty is

changed.

Change

↓

Frequency

(FREQ)

Period

(PERIOD)

Pulse width

(WIDTH)

Duty

(DUTY) Frequency

(FREQ) Changed Changed Unchanged

Period

(PERIOD) Changed Unchanged Changed

Pulse width

(WIDTH) Unchanged Unchanged Changed

Duty

(DUTY) Unchanged Unchanged Changed

• Due to the oscillation period and duty relationship, the pulse can be lost when the actual pulse width is

less than 25 ns. An error message is displayed at this type of setting. Also, jitter increases when the pulse width is less than 100 ns. A warning message is displayed at this type of setting.

• The actual waveform duty resolution is [oscillation frequency] ÷ [approx. 40 MHz] (0.00001 % at minimum). When the stop level is on, the minimum actual waveform duty resolution is approximately 0.003 %.

• For other notes, see "Waveform selection " in Section 3.3, "Basic operation."


5-4 WF1943B

Squarewave pulse width setting ( ENTRY

→ WIDTH )

Operation to set the squarewave pulse width is described. The setting changes the width of the pulse

(portion indicated by arrows

).

Select squarewave ( variable duty).

Operation:


WIDTH key to produce the following display.

Ｗ０．０００５０００００ｓＡ０．１０００Ｖｐ－ｐＯ＋０．００００Ｖ／ＯＰＥＮ

② Set the width with the keypad orMODIFY

dial.

Other:

• The table indicates the effects on other parameters when the frequency, period, width or duty is changed.

Change

↓

Frequency

(FREQ)

Period

(PERIOD)

Pulse width

(WIDTH)

Duty

(DUTY) Frequency

(FREQ) Changed Changed Unchanged

Period

(PERIOD) Changed Unchanged Changed

Pulse width

(WIDTH) Unchanged Unchanged Changed

Duty

(DUTY) Unchanged Unchanged Changed

• Due to the oscillation period and duty relationship, the pulse can be lost when the actual pulse width is

less than 25 ns. An error message is displayed at this type of setting.

Also, jitter increases when the pulse width is less than 100 ns. A warning message is displayed at

this type of setting.


WF1943B 5-5

Amplitude and DC offset setting by high and low level ( ENTRY →

HIGH / LOW )

Operation to set the waveform vertical size as high and low level, in place of amplitude and DC offset, is described. Select the waveform type for squarewave.

Operation:


HIGH key to produce the following display.

ＨＩＧＨ＋０．０５００Ｖ１０００．０００００００ＨｚＬ－０．０５００Ｖ／ＯＰＥＮ

② Set the High level with the keypad orMODIFY

dial.

For example, set to +5 V.

③ Press the EXIT key, then the

LOW key to produce the following display.

ＬＯＷ－０．０５００Ｖ１０００．０００００００ＨｚＨ＋５．００００Ｖ／ＯＰＥＮ

④ Set the Low level with the keypad orMODIFY

dial.

For example, set to +0 V.

Amplitude: 5Vp-p High level: +5V

DC offset: +2.5VLow level: +0V 0


5-6 WF1943B

Other: The table indicates the effects on other parameters when the amplitude, DC offset, high level or low level is changed

Change ↓

Amplitude (AMPTD)

DC offset (OFFSET)

High level(HIGH)

Low level (LOW)

Amplitude (AMPTD)

Unchanged Changed Changed

DC offset (OFFSET)

Unchanged Changed Changed

High level (HIGH)

Changed Changed Unchanged

Low level (LOW)

Changed Changed Unchanged

• Due to the relationships between high and low level settings, and between amplitude and DC offset

settings, when the output voltage exceeds the following values, the Over lamp flashes and the output is clipped in some cases.

10 V range: Approx. 11 V peak/open time 1 V range: Approx. 1.1 V peak/open time

WF1943B 5-7

5.2 Units

Engineering unit (µ, m, k, M) display

Operation is described for displaying engineering units (e.g., the k of 1 kHz). As an example, the frequency units are changed.

Operation:


key.

１０００．００００００００ＨｚＡ０．１０００Ｖｐ－ｐＯ＋０．００００Ｖ／ＯＰＥＮ

② Press the k key to change the display as follows.

１０００．００００００００ｋＨｚＡ０．１０００Ｖｐ－ｐＯ＋０．００００Ｖ／ＯＰＥＮ

Other:

• Unit change enable: Only when the µ , m , k or M key is lighted.

• Initializing units (e.g., from kHz to Hz): At above step②, press the ENTER key.

5.2 Units

5-8 WF1943B

Amplitude units change

Operation to change the amplitude units is described. For example, set to Vrms.

Operation:

① Press the ENTRY key, then the AMPTD

key.

② Press the key to produce the following display (Vp-p lights).

ＡＭＰＴＤ０．１０００Ｖｐ－ｐ１０００．０００００００ＨｚＯ＋０．００００Ｖ／ＯＰＥＮ

③ Turn theMODIFY

dial to produce the following display.

ＡＭＰＴＤ０．０３５４Ｖｒｍｓ１０００．０００００００ＨｚＯ＋０．００００Ｖ／ＯＰＥＮ

Other:

• The following units can be used.

• Vp-p, Vrms, dBV, dBm (*1), USER (*2) *1: Selectable when LOAD function is SET. *2: Set User units name is displayed. Notes: Only Vp-p and USER can be selected when the oscillation mode is NOISE.

Only Vp-p and USER can be selected when the selected waveform is ARB.

• Even if the amplitude units are changed, the actual output voltage does not change.

5.2 Units

WF1943B 5-9

User-unit setting ( SYSTEM → USER-UNIT)

Operation for changing the units by using the user unit function is described. For example, set for expressing frequency as rpm (revolutions per minute, e.g., engine rotation).

Operation: (1) Select setting type, for example, frequency

① Press the SYSTEM key, then use the and keys to produce the following display (USER-

UNIT flashes).

ＵＳＥＲＵＮＩＴＭＥＮＵＳＹＳＴＥＭ：ＲＡＮＧＥＰＲＥＳＥＴＵＳＥＲ－ＵＮＩＴ 4

② Press the ENTER key, then use the and keys to produce the following display (TYPE

flashes).

ＦＲＥＱＰＥＲＩＯＤＡＭＰＴＤ 4 ＵＳＥＲＵＮＩＴ：ＴＹＰＥＮＡＭＥＦＯＲＭＵＬＡ 4

③ Again press the ENTER key, then use the and keys to produce the following display

(FREQ flashes).

ＦＲＥＱＰＥＲＩＯＤＡＭＰＴＤ 4 ＵＳＥＲＵＮＩＴ：ＴＹＰＥＮＡＭＥＦＯＲＭＵＬＡ 4

④ This selects the setting type to frequency. Press the EXIT

key once to release the type select

mode.

5.2 Units

5-10 WF1943B

(2) Set the unit NAME (e.g., rpm)

① Use the and keys to produce the following display (NAME flashes).

ＵＳＥＲＵＳＥＲＵＮＩＴ：ＴＹＰＥＮＡＭＥＦＯＲＭＵＬＡ 4

② Press the ENTER key, then use the

MODIFY

dial and and keys to input the unit name

(e.g., rpm). Up to 4 of the following characters can be used for the unit name.

a b c d e f g h i j k l m n o p q r s t u v w x y z ( s p a c e )

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0 1 2 3 4 5 6 7 8 9 ! ” # $ % & ’ ( ) * + , − . / : ; < = > ? @ [ ¥ ] ^ _ ` | →←

③ After inputting, press the EXIT key once to release unit name setting.

(3) Select the FORMULA, for example, (h+n)*m. The setting type (e.g., frequency) is h, n is offset,

and m is the coefficient.

① Use the and keys to produce the following display (FORMULA flashes).

（ｈ＋ｎ）＊ｍ（Ｌｏｇ（ｈ）＋ｎ）＊ｍＵＳＥＲＵＮＩＴ：ＴＹＰＥＮＡＭＥＦＯＲＭＵＬＡ 4


[(h+n)*m flash].

（ｈ＋ｎ）＊ｍ（Ｌｏｇ（ｈ）＋ｎ）＊ｍＵＳＥＲＵＮＩＴ：ＴＹＰＥＮＡＭＥＦＯＲＭＵＬＡ 4

③ This sets the formula to (h+n)*m. Press the EXIT key once to release the formula setting mode.

5.2 Units

WF1943B 5-11

(4) Set the coefficient [SCALE (m)], e.g., to 60

① Use the and keys to produce the following display (SCALE (m) flashes).

＋１．００００００００００００００Ｅ＋０ＵＳＥＲＵＮＩＴ：3 ＳＣＡＬＥ（ｍ）ＯＦＦＳＥＴ（ｎ）

② Press the ENTER key, then set the scale with the keypad or

MODIFY

dial.

③ Press the EXIT key to release the scale setting mode.

(5) Set the offset [OFFSET (n)], for example, to 0

① Use the and keys to produce the following display [OFFSET (n) flashes].

＋０．００００００００００００００Ｅ＋０ＵＳＥＲＵＮＩＴ：3 ＳＣＡＬＥ（ｍ）ＯＦＦＳＥＴ（ｎ）

② Press the ENTER key, then set the offset with the keypad or

MODIFY

dial.

③ Press the EXIT key to release the offset setting mode.

(6) Display the above settings


key.

② Press the key to produce the following display (Hz flashes).

１０００．００００００００ＨｚＡ０．１０００Ｖｐ－ｐＯ＋０．００００Ｖ／ＯＰＥＮ

③ Turn theMODIFY

dial to produce the following display.

６００００．０００００００ｒｐｍＡ０．１０００Ｖｐ－ｐＯ＋０．００００Ｖ／ＯＰＥＮ

5.2 Units

5-12 WF1943B

Other:

• User units can be used for frequency, period, amplitude, DC offset, phase and duty. • Even when user units are set, the actual output does not change. • According to the coefficient and offset settings, setting resolution may be less precise when user units

are used. • When using user units for the DC offset and phase in LOG selection, note the following.

If a negative value is set before the conversion to user units is made, an attempt is made to calculate the logarithm of a negative value. Since the logarithm of a negative value cannot be a real number, "OVER" is displayed. Thereafter, user setup values can be arbitrarily changed. However, the DC offset and phase output to FUNCTION OUT cannot be converted to a negative value while user units are being used.

WF1943B 5-13

5.3 Setting memory

Setting store ( MEMORY : STORE) Operation is described for saving frequency, amplitude and other settings in memory.

Operation:

① Press the MEMORY key, then use the and keys to produce the following display (STORE

flashes).

ＳＴＯＲＥＭＥＮＵＭＥＭＯＲＹ：ＳＴＯＲＥＲＥＣＡＬＬＣＬＥＡＲ


(0 flashes).

（ＮＯＴＳＴＯＲＥＤ）ＳＴＯＲＥ：０１２３４５６７８９

③ Press the ENTER key, then apply a desired name to the memory (may also be omitted). Select

characters with theMODIFY

dial and shift position with the and keys.

Up to 20 characters can be selected from the following list. a b c d e f g h i j k l m n o p q r s t u v w x y z ( s p a c e )

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0 1 2 3 4 5 6 7 8 9 ! ” # $ % & ’ ( ) * + , − . / : ; < = > ? @ [ ¥ ] ^ _ ` | →←

④ Press the ENTER key to store the name (in this example, save to memory 0).

The above completes memory storage. Press the EXIT key to release the storage mode.

Other:

• By pressing the keypad at above step ②, name input is omitted and storage is at the memory of the

depressed number.

5.3 Setting memory

5-14 WF1943B

Setting recall ( MEMORY : RECALL) Operation to recall settings from memory is described.

Operation:

① Press the MEMORY key, then use the and keys to produce the following display

(RECALL flashes).

ＲＥＣＡＬＬＭＥＮＵＭＥＭＯＲＹ：ＳＴＯＲＥＲＥＣＡＬＬＣＬＥＡＲ

② Press the ENTER key, then use the and keys to produce the following display (0

flashes). In this example, TEST 1 is recalled from memory.

ＴＥＳＴ１ＳＴＯＲＥ：０１２３４５６７８９

③ Press ENTER key for recall.

Other:

• If the keypad is pressed at above step ②, the pressed memory number is recalled. Only the stored

numbers of the keypad light.

• Items stored in the setting memory and user unit settings are noted in Section [3.3 Basic operation, Setting initialize]. The following items do not change before and after recall.

• Output on/off • Output on/off state at power on • Arbitrary waveform parameter • Type of remote control • GPIB parameter • USB ID

5.3 Setting memory

WF1943B 5-15

Setting memory clear ( MEMORY : CLEAR) Operation to clear the memory is described. The operation also clears names entered in the memory.

Operation:

① Press the MEMORY key then use the and keys to produce the following display (CLEAR

flashes).

ＣＬＥＡＲＭＥＮＵＭＥＭＯＲＹ：ＳＴＯＲＥＲＥＣＡＬＬＣＬＥＡＲ


(0 flashes). In this example, TEST 1 is cleared from memory.

ＴＥＳＴ１ＣＬＥＡＲ：０１２３４５６７８９

③ Press ENTER key to clear the memory recall.

Other:

• At above step ②, pressing the keypad clears the corresponding memory number. Only the stored

numbers of the keypad light.

5-16 WF1943B

5.4 Other settings

Output range change (use with fixed range) ( SYSTEM : RANGE)

Operation is described for fixing the voltage output range to 10 V. Although AUTO is normally used, by fixing the range, output interruption from automatic switching can be avoided. A disadvantage is during output voltage below 2 Vp-p (open), setting resolution is 1 digit less than the 1 V range.

Operation:


(RANGE flashes).

ＡＵＴＯ１０Ｖ１ＶＳＹＳＴＥＭ：ＲＡＮＧＥＰＲＥＳＥＴＵＳＥＲ－ＵＮＩＴ 4

② Press the ENTER key, then use the and keys to produce the following display (10 V

flashes).

ＡＵＴＯ１０Ｖ１ＶＳＹＳＴＥＭ：ＲＡＮＧＥＰＲＥＳＥＴＵＳＥＲ－ＵＮＩＴ 4

Other:

• If the output range is set as 1 V when the amplitude setting is larger than 2 Vp-p (open), the amplitude is automatically changed to 1/10 since voltage exceeding 2 Vp-p (open) cannot be output in the 1 V range.

5.4 Other settings

WF1943B 5-17

Output on/off at power on ( SYSTEM : POWER - ON) Selectable return to the state when the power supply was switched off or output on/off state. The example is setting the output for off at power on.

Operation:


(POWER-ON flashes).

ＬＡＳＴ－ＳＴＡＴＥＯＦＦＯＮＳＹＳＴＥＭ：3 ＳＹＮＣＯＵＴＰＯＷＥＲ－ＯＮＲＥＭＯＴＥ

② Press the ENTER key, then use the and keys to produce the following display (OFF

flashes).

ＬＡＳＴ－ＳＴＡＴＥＯＦＦＯＮＳＹＳＴＥＭ：3 ＳＹＮＣＯＵＴＰＯＷＥＲ－ＯＮＲＥＭＯＴＥ

5.4 Other settings

5-18 WF1943B

LOAD function (equalize setting and output values) ( SYSTEM : LOAD)

Operation is described for equalizing the amplitude (AMPTD) and DC offset (OFFSET) setting values with the actual output values (FUNCTION OUT connector voltage). The example is setting at the 100Ωload impedance.

Operation:

① Press the SYSTEM key, then use the and keys to produce the following display (LOAD

flashes).

ＯＰＥＮＳＹＳＴＥＭ：3 ＬＯＡＤ ФＳＹＮＣＤＵＴＹ－ＶＡＬＩＤ 4

② Press the ENTER key, then turn the

MODIFY

dial to produce the following display(SET flashes).

ＳＥＴ５０ Ω ＳＹＳＴＥＭ：3 ＬＯＡＤ ФＳＹＮＣＤＵＴＹ－ＶＡＬＩＤ 4


dial to set the load impedance to 100 Ω.

The above setting calculates the actual voltage of FUNCTION OUT connector from the WF1943B output impedance (50 Ω) and the load impedance for automatically changing the indicated value.

Other:

• The load impedance setting range is 45 to 999 Ω, resolution is 1 Ω. • The WF1943B output impedance and voltage errors are not converted.

5.4 Other settings

WF1943B 5-19

UNDO function

The UNDO function is described for returning a numerical or other setting to the previous state.

Operation:

① Press the UNDO to return a setting to the previous state (ineffective when UNDO is extinguished).

Other:

• Undo enabled:

1. Directly after changing frequency, amplitude, etc., with the keypad or MODIFY dial.

2. Directly after setting recall ( MEMORY

→ RECALL). Press the UNDO key to return the state

prior to recall.

5.4 Other settings

5-20 WF1943B

Pulse generator function

Operation of the WF1943B as a pulse generator is described.

Operation: (1) Set for continuous pulse output

① Set the waveform to squarewave (variable duty), ( FUNCTION → ).

② Set the voltage High level to +5 V and the Low level to 0 V.

( ENTRY →

HIGH → 5 → ENTER

, ENTRY

→ LOW → 0 →

ENTER

)

③ Set the period to 2 ms ( ENTRY →

PERIOD → 2 →

m ).

④ Set the pulse width to 0.2 ms ( ENTRY →

WIDTH →

・ → 2 →

m ).

(2) Use external trigger for pulse output

① Set the waveform to squarewave (variable duty), ( FUNCTION → ).

② Set the voltage High level to +5 V and the Low level to 0 V.

( ENTRY →

HIGH → 5 → ENTER

, ENTRY

→ LOW →

0 → ENTER )

Period: 2 ms

Pulse width: 0.2 ms

5V

0V

Pulse width: 0.5 ms

Delay time: 0.1 ms

5V

0V

Trigger signal (TRIG/SWEEP IN)

5.4 Other settings

WF1943B 5-21

③ Set the pulse width to 0.5 ms ( ENTRY →

WIDTH →

・ → 5 →

m ).

④ Set oscillation mode.

( MODE → BURST

→TYPE = TRIG, SOURCE = EXT

, DELAY = 0.1 ms,

MARK = 1.0 cycle, STOP-LEVEL = ON −100%) ⑤ Apply the trigger signal to the TRIG/SWEEP IN connector.

Other:

• Double pulse output: At above step ④, set MARK = 2.0 cycles.

• Manual trigger: At above step ④, set SOURCE = EXT

and press the MAN TRIG key.

(Do not connect anything to the TRIG/SWEEP IN connector.)

5.4 Other settings

5-22 WF1943B

Phase initialization ( SYSTEM : φ SYNC) The operation for restarting the output waveform from the setup phase is described.

Phase initialization operation and waveform output (when the phase = 0 degrees) Operation:

① Press the

SYSTEMkey, then use the and keys to produce the following display (φ

SYNC flashes).

ФＳＹＮＣＳＹＳＴＥＭ：3 ＬＯＡＤ ФＳＹＮＣＤＵＴＹ－ＶＡＬＩＤ 4

② Press theENTER

key to perform phase initialization.

Other:

φ sync is effective in Normal oscillation mode. In other modes, the phase may shift 180 degrees and the values of the mark cycle and space cycle settings may change.

WF1943B 6-1

Section 6 Troubleshooting

6.1 Error message ············································································································6-2 Power on error ···································································································6-2 Operation error···································································································6-3

6.2 Suspected failure········································································································6-6 In case of abnormality························································································6-6

6-2 WF1943B

6.1 Error message

Self-check is conducted at power on and in case of an abnormality, an error message is displayed. An error message is also displayed if an erroneous operation is conducted.

Error message contents, causes and corrective measures are indicated in the following tables.

Power on error

Error message Cause Corrective measures

BACKUP MEMORY LOST

Battery backup memory contents destroyed.

Backup battery probably depleted. Contact dealer. Press the ENTER key to start the system at the factory settings.

CALIBRATION MEMORY LOST

Calibration data destroyed.

Contact dealer. Although possible to start by pressing the ENTER key, accuracy cannot be guaranteed.

SYSTEM TEST FAILED 001

Internal ROM sum check error.

Contact dealer.

SYSTEM TEST FAILED 002

Internal RAM read/write error.

Contact dealer.

6.1 Error message

WF1943B 6-3

Operation error

Error message Cause or corrective measures

DATA OUT OF RANGE

Input values outside of permissible setting range. Confirm permissible setting range and again input. Upper and lower limits can be easily checked by using the MODIFY dial to change the values.

INVALID NUMERIC DATA Keypad input data invalid (e.g., decimal point only).

SETTINGS CONFLICT 001

Start or stop value set to 0 during LOG sweep and sweep cannot be executed.


Combined center and span exceed the permissible sweep type (e.g., frequency) setting range.


Combined modulation type (e.g., frequency) and Deviation exceed the permissible modulation type setting range and modulation cannot be executed.


Combined modulation type (e.g., frequency) and Deviation exceed the permissible modulation type setting range.


Combined period and pulse width exceed the permissible duty setting range.


Since the mode is SWEEP or MODU for (variable duty),

DUTY-VALID cannot be set.

continued next page

6.1 Error messag

6-4 WF1943B

continued from previous page

Error message Cause or corrective measures

STORE/RECALL MEMORY LOST

Setting storage memory contents destroyed and settings cannot be recalled. Contact dealer.

WARNING 001 Combined frequency and duty set the pulse width to not more than 25 ns and the pulse may be lost.

WARNING 002 Combined frequency and duty set the pulse width to 25 and 100 ns and pulse width may be unstable (large jitter component).

WARNING 003 Since high frequency, burst oscillation mark and space may be unstable.

WARNING 004 Low level setting changed due to high level setting change, or conversely, high level setting changed due to low level setting change.

WARNING 005 Changed to simple standard units (Hz, s, Vp-p, V).

WARNING 006 Since combined period and pulse width exceed the permissible duty setting range, pulse width was changed in order to enter the permissible duty range.

WARNING 010

The sweep function was changed from LOG to LIN.

WARNING 011

The sweep mode was changed from gated to single.

6.1 Error message

WF1943B 6-5

continued from previous page

Error message Cause and treatment

WARNING 013 Sweep time or modulation frequency exceeded the settable range and was automatically changed to within the permissible setting range.

WARNING 015 Because of DUTY-VALID change, the duty was changed to 0.01% or 99.99%.

WARNING 017 Because of a mode change, DUTY-VALID was changed to IMMED.

6-6 WF1943B

6.2 Suspected failure

In case of abnormality

If an abnormality is suspected, check as indicated in the following table. If normal operation cannot be returned, contact the dealer.

Symptom Possible causes Correction

Power source not within specified range

Use the power source within the specified range.

Power supply fuse open Replace the power supply fuse. (Be sure to use the correctly rated fuse.)

No power on

External noise Install the equipment in a site with favorable conditions.

Remote mode enabled Press the LOCAL key to set the local mode.

Panel inoperative

Keys or Modify dial defective

Contact service.

Ambient temperature and humidity outside specified range

Use the equipment under the specified environmental conditions.

Inadequate warm up Allow the equipment to warm up for at least 30 minutes after power on.

DC offset applied Set DC offset to 0 V.

Set for user units Select standard units

Output abnormal

LOAD function being used Set for OPEN.

Address or USB ID different from that in the program

Set the address and USB ID to match those in the program.

Cannot be set via remote control

Address or USB ID identical to that of another device

Set the address and USB ID so that they do not match those of other devices.

Does not operate according to instruction manual

Settings have been initialized (PRESET).

The instruction manual presumes the settings have been initialized.

WF1943B 7-1

Section 7 Maintenance

7.1 Outline ·······················································································································7-2 Work contents ····································································································7-2 Required test instruments ···················································································7-2

7.2 Operation checks ·······································································································7-3 Preparatory checks ·····························································································7-3 Function checks ·································································································7-3

7.3 Performance tests·······································································································7-5 Performance tests ·······························································································7-5 Preparatory checks ·····························································································7-5 Test preparation ·································································································7-5 Frequency accuracy ···························································································7-5 Amplitude accuracy ···························································································7-6 DC offset accuracy·····························································································7-6 Amplitude vs. frequency characteristics·····························································7-7 Sinewave distortion····························································································7-7 Squarewave response ·························································································7-8 Duty factor ·········································································································7-8

7-2 WF1943B

7.1 Outline

Work contents The following types of maintenance are required in order to use the equipment in optimum condition.

Inspection Check that the equipment is operating correctly. Performance tests Check that the equipment meets specifications. Adjustment and calibration When the equipment does not meet specifications, it is adjusted

and calibrated in order to restore performance at the manufacturer. Service Cause and location of failure are investigated and repair is

conducted at the company.

This instruction manual provides easily carried out procedures for inspection and performance checks. Consult the manufacturer or dealer regarding more thorough inspection, adjustment, calibration and repair.

Do not remove external covers. Internal inspection of this equipment must be performed only by a trained service technician who is fully aware of the hazards involved.

Required test instruments

The following equipment is required for inspection and performance tests.

Oscilloscope At least 100 MHz bandwidth Universal counter Reference oscillator accuracy better than 5 × 10−7 DC voltmeter Accuracy better than 0.1 % AC voltmeter 1 True rms, accuracy better than 0.3 %, bandwidth at least 100kHz,

recommended: Keithley Model 2001 AC voltmeter 2 True rms, accuracy better than 1 %, bandwidth at least 20MHz,

recommended: Boonton Model 9200C+952016+952002 Distortion meter Full scale 0.1 %, frequency up to 100 kHz 50 Ω feed through terminator 50 Ω 20 dB attenuator

! WARNING

WF1943B 7-3

7.2 Operation checks

Preparatory checks

Check the following before inspection.

Power source voltage is within specified range. Ambient temperature is within 5 to 35 °C. Ambient relative humidity is within 5 to 85 %RH (absolute humidity: 1 to 25 g/m3) Condensation is absent.

Function checks

Power on Confirm absence of error message at power on. If an error message appears, “6. Troubleshooting”, cf. If an abnormal indication appears at power on, switch power off and wait at least 5 seconds, then again switch power on.

Main function checks

To avoid setting error, initialize the settings ( SYSTEM → PRESET).

Connect FUNCTION OUT to an oscilloscope with 50 Ω coaxial cable to monitor the output. Operate to change the following settings several times and confirm normal functions. Test both keypad and MODIFY dial for settings such as frequency.

・Frequency ( ENTRY → FREQ

)

・Amplitude ( ENTRY → AMPTD

)

・DC offset ( ENTRY → OFFSET

)

・Waveform ( FUNCTION →

，

， Duty fixed 50 %，

， )

・Duty ( FUNCTION → Variable duty， ENTRY

→ DUTY )

・Output on/off ( OUTPUT

ON/OFF )

7.2 Operation checks

7-4 WF1943B

Backup function

Switch off the power, wait at least 5 seconds, then switch the power on. Confirm the settings for the following items prior to switching off the power have been correctly saved.

・Frequency ・Amplitude ・DC offset ・Waveform ・Duty

If stored at room temperature, the backup period is typically 3 years, but may vary among individual units and usage conditions. To prevent any loss of setting information resulting from a depleted battery, regular battery replacement is recommended.

GPIB/USB Conduct some of the main function checks via GPIB/USB and confirm the same output variations. Also note that the remote (REM) indicator lights. Press the

LOCAL key and confirm the remote indicator extinguishes and the local mode is

returned (not local lock out).

WF1943B 7-5

7.3 Performance tests

Performance tests

Performance tests are an important part of preventive maintenance and serve to prevent serious deterioration of the equipment performance. Conduct these tests at incoming inspection, routine inspection, following repair and whenever performance needs to be confirmed. When specifications are not met in performance tests, service is required. Contact the dealer.

Preparatory checks

Check the following before testing performance.

Power source voltage is within specified range. Ambient temperature is 23 ± 5 °C. Ambient relative humidity is within 20 to 70 % RH. Condensation is absent. Allow at least 30 minutes warm up.

Test preparation

Signal cables are 50 Ω coaxial, RG-58A/U or thicker, less than 1 meter length and fitted at both

ends with BNC connectors. Where items call for 50 Ω termination, set the input impedance of the connected instrument to 50 Ω.

Where this is impossible, use a 50 Ω feed through terminator at the test instrument input.

Initialize the settings for each test item ( SYSTEM → [PRESET]), set the output on (key internal

LED lights according to OUTPUT

ON/OFF ) and the item to be changed is indicated.

Frequency accuracy

Connection: Use coaxial cable to connect FUNCTION OUT to a universal counter (50 Ω termination). Setting: Initialize, then set frequency to 1 MHz and amplitude to 20 Vp-p/open. Measurement: Measure frequency with the universal counter. Judgment: Normal if within ±5 ppm (999.995 to 1.000005 MHz) (when shipped)

However, since aging may occur with up to ±3 ppm/year, deterioration up to ±8 ppm (999.992 to 1.000008 MHz) may have occurred if one year has passed since shipment.


7-6 WF1943B

Amplitude accuracy

Connection: Use coaxial cable to connect FUNCTION OUT to AC voltmeter 1. Setting: After setting initialize, set the amplitude, output range and waveform as indicated in the following table. Measurement: Measure the true rms output voltage for each waveform. Judgment: The normal ranges are indicated in the table.

Waveform Output range Setting Normal range

10 V 20 Vp-p/open (7.071 Vrms/open) 7.004 to 7.138 Vrms

, , 10 V 20 Vp-p/open ( 5.774 Vrms/open) 5.719 to 5.828 Vrms

10 V 20 Vp-p/open ( 10.00 Vrms/open) 9.905 to 10.095 Vrms

10 V 10 Vp-p/open ( 3.536 Vrms/open) 3.493 to 3.578 Vrms




DC offset accuracy Connection: Connect FUNCTION OUT to a DC voltmeter. Setting: After setting initialize, set the DC mode, output range and DC offset as indicated in the following table. Measurement: Measure the output voltage. Judgment: The normal ranges are indicated in the table.

Output range DC offset setting Normal range

10 V ±10.000 V/open ±9.880 to ±10.12 V

10 V ±5.000 V/open ±4.905 to ±5.095 V

10 V ±2.000 V/open ±1.920 to ±2.080 V

10 V ±1.000 V/open ±0.925 to ±1.075 V

10 V 0.000 V/open −0.070 to +0.070 V

1 V ±1.0000 V/open ±0.985 to ±1.015 V

1 V 0.0000 V/open −0.010 to +0.010 V


WF1943B 7-7

Amplitude vs. frequency characteristics Connection: Use coaxial cable to connect FUNCTION OUT to AC voltmeter 2 (50 Ω termination). Setting: Initialize, then set the amplitude to 20 Vp-p/open and select the frequency and waveform as indicated in the table. Measurement: Measure the true rms output voltage for each frequency and waveform. Judgment: The normal ranges are indicated in the table.

Waveform 1 kHz Setting

to 500 kHz to 1 MHz to 3 MHz to 10 MHz to 15 MHz

(Reference value) +0.2/-0.3 dB +0.2/-0.3 dB +0.35/-0.7 dB +0.5/−1.5 dB +0.5/−2.0 dB

(Reference value) ±0.3 dB ―――― ―――― ―――― ――――

(Reference value) ±0.3 dB ±0.3 dB ―――― ―――― ――――



Sinewave distortion

Connection: Use coaxial cable to connect FUNCTION OUT to a distortion meter (50 Ω termination).

Setting: Initialize, then set the amplitude to 20 Vp-p/open and the frequency as indicated in the table.

Measurement: Measure the distortion Judgment: The normal range is indicated in the table.

Frequency Normal range 10 Hz to 100 kHz 0.2 % or less

(Bandwidth 500 kHz)


7-8 WF1943B

Squarewave response

Connection: Use coaxial cable to connect FUNCTION OUT to an oscilloscope (50 Ω termination). Setting: Initialize, then set , frequency to 1 MHz and amplitude to 20 Vp-p/open. Measurement: Observe the waveform and measure the rise and fall times, overshoot and undershoot. Judgment: The normal range is indicated in the table.

Item Normal range

Rise and fall times 20 ns or less

Overshoot and undershoot 5 % or less

Duty factor

Connection: Use coaxial cable to connect Function Out to a universal counter (50 Ω terminated). Settings: Initialize the settings, then set amplitude to 20 Vp-p, and waveform and frequency

according to the following table. Measurement: Set the counter rise and fall period to the interval timer mode and measure the duty

(time). Use the average value, since jitter will cause dispersion in the measurement values.

Determination: The ranges indicated in the following table are normal.

Waveform Frequency Rated range (duty 50 % fixed) 1 MHz 490 to 510 ns (duty 50 % fixed) 10 MHz 47.0 to 53.0 ns (duty 50 % fixed) 15 MHz 30.0 to 36.7 ns

(duty variable) 100 kHz 4.90 to 5.10µ s

WF1943B 8-1

Section 8 Specifications

8.1 Waveform and output characteristics ·········································································8-2 8.2 Output voltage ···········································································································8-4 8.3 Other functions ··········································································································8-5 8.4 Initialized settings······································································································8-9 8.5 Remote control ··········································································································8-10 8.6 General items·············································································································8-11

External drawing································································································8-12

Guaranteed values are shown with tolerance, values without tolerance are for reference.

8-2 WF1943B

8.1 Waveform and output characteristics

Waveforms (FUNCTION OUT) Output waveforms Waveform vertical resolution Output waveform and frequency For continuous oscillation For burst, trigger, gate, triggered gate, or gated sweep Frequency Range Resolution Accuracy when shipped Aging Setting by period Duty Range Resolution

, , (Duty 50 % fixed), (Duty variable), , , arbitrary waveform (ARB),

and noise (NOISE), DC voltage (DC) 14 bit ( , , , , arbitrary waveform (ARB))

, (duty 50% fixed)：0.01 µHz to 15 MHz , (duty variable), , ：0.01 µHz to 500 kHz

Arbitrary waveform：0.01 µHz to 500 kHz However, the frequency in which all the data of arbitrary waveforms can be outputted is the maximum of the following value.

(40MHz) ÷ [waveform data size (words)]Analog band width 10MHz

0.01 µHz to 500 kHz 0.01 µHz to 15 MHz 0.01 µHz ±5 ppm ±3 ppm/year Frequency equivalent to inverse number of the setting period. If the number is less than 0.01 µHz, the number should be rounded off. 0.0100% to 99.9900%/0.0000% to 100.0000% 0.0001 %

Arbitrary waveform data size Number of arbitrary waveforms Arbitrary waveform data edit Arbitrary waveform data resolution

Can be switched among 8 K, 16 K, 32 K, and 64 K words. 1 K words equal 1024 words. Number of arbitrary waveforms that can be select, and waveforms are backed up 12 waveforms for 8 K words/6 waveforms for 16 K words/ 3 waveforms for 32 K words/1 waveform for 64K words Point specification and linear interpolation by the panel operation or data writing by GPIB or USB 16 bits (-32768 to 0 to +32767) For output waveform, upper 14 bits are output.

8.1 Waveform and output response

WF1943B 8-3

Noise Noise source: pseudo-M-series by 42-step shift register

Period 30.518 hours, Spectrum interval 9.1022 µHz

White noise bandwidth (equivalent noise bandwidth): about 500 kHz Peak factor (crest factor): 6

Amplitude can be set in Vp-p. rms value = (Vp-p set point) ÷ 2 ÷ (peak factor)

Binary output: Outputs from SYNC OUT during NOISE mode.

Output characteristics (FUNCTION OUT)

Amplitude frequency characteristics spectrum purity

Total harmonic distortion Harmonic spectrum

Spurious output

waveform characteristics Duty

Continuous oscillation, 50 Ω load, DC offset 0 V, amplitude setting 10 Vp-p/50 Ω, normalized frequency 1 kHz, effective rms value measurement

Up to 1 MHz: +0.2 dB, −0.3dB 1 MHz to 3 MHz: +0.35 dB, −0.7 dB 3 MHz to 10 MHz: +0.5 dB, −1.5 dB 10 MHz to 15 MHz: +0.5 dB, −2.0 dB

Up to 1 MHz: ±0.3 dB Up to 500 kHz: ±0.3 dB , Up to 500 kHz: ±0.5 dB

Continuous oscillation, 50 Ω load, DC offset 0 V, amplitude setting 10 Vp-p/50 Ω, 10 Hz − 100 kHz: 0.2 % and below (bandwidth: 500 kHz) 100 kHz to 1 MHz: −50 dBc 1 MHz to 15 MHz: −30 dBc Up to 15 MHz: −35 dBc Continuous oscillation, 50 Ω load, DC offset 0 V, amplitude setting 10 Vp-p/50 Ω, Rise and fall time: 20 ns and below Overshoot: 5 % and below Continuous oscillation, 50 Ω load, DC offset 0 V, amplitude setting 10 Vp-p/50 Ω

(50 % fixed duty) Up to 1 MHz: ±1 % of the period 1 MHz to 10 MHz: ±3 % of the period 10 MHz to 15 MHz: ±5 % of the period (duty variable) Up to 100 kHz: ±1 % of the period Jitter: 30 nsp-p and below

8-4 WF1943B

8.2 Output voltage

Output voltage (FUNCTION OUT)

Output range Amplitude

Range Resolution Accuracy

DC offset (including when DC

voltage is generated) Range Resolution Accuracy

Amplitude and DC offset limiting Output impedance Load impedance Output connector Others

10 V range / 1V range fixed, or automatic switchable 10 V range : 0 mVp-p to 20.000 Vp-p/open 1 V range : 0.0 mVp-p to 2.0000 Vp-p/open 10 V range : 1 mVp-p/open 1V range : 0.1 mVp-p/open Continuous oscillation. , 1 kHz, rms value measured 10 V range : ± [0.7 % of amplitude setting (Vp-p) + 0.05 Vp-p]/open1 V range : ± [0.7% of amplitude setting (Vp-p) + 0.01 Vp-p]/open 10 V range : ±10.000 V/open 1 V range : ±1.0000 V/open 10 V range : 1 mV/open 1 V range : 0.1 mV/open DC mode 10 V range : ± (0.5% of DC offset setting [V] + 0.07 V)/open 1 V range : ± (0.5% of DC offset setting [V] + 0.01 V)/open If output voltage exceeds the following value, the OVER light blinks and the output may be clipped. 10 V range : 11 V/open 1 V range : 1.1 V/open 50 Ω, unbalanced 45 Ω and more Front panel, BNC receptacle (FUNCTION OUT) Output voltage can be set with high and low level buttons.

SYNC OUT Output voltage (SYNC OUT)

Output voltage Output waveform Rise/fall time Output impedance Load impedance Output connector

0/+5V (open)

2.5 ns 50 Ω, unbalanced 45 Ω and more Front panel BNC receptacle (SYNC OUT)

WF1943B 8-5

8.3 Other functions

Burst

Oscillation modes Mark wave number Space wave number Phase

Range Resolution

Trigger source External trigger

Polarity Input level Minimum pulse width Input impedance Input connector

Internal trigger oscillator Range Resolution

Trigger delay Range Resolution

Trigger jitter Oscillation stop level

Range Resolution

Burst, gate, trigger and trig’d gate (Trig’d gate: gate on/off at each trigger) 0.5 to 500000.0, 0.5 wave unit (The mark wave number is the oscillation wave number at the time of burst and trigger). 0.5 to 500000.0, 0.5 wave unit (Space wave number is the stop wave number at the time of burst). Phase from oscillation stop to oscillation start −1800.000° to +1800.000° 0.001° Selectable internal trigger oscillator or external trigger input. Trigger can be applied from the panel keys or via remote control (GPIB or USB). Trigger: Rising or falling edge selectable Gate: Positive or negative logic selectable. Trig’d gate: Rising or falling edge selectable High level ≥ +3.9 V, low level ≤ +1.6 V 50 ns At 10 kΩ, pull up to +5 V. Front panel BNC receptacle (TRIG/SWEEP IN) 1µs to 100.0 s 4 digits at 1 ms and more, 1 µs at less than 1 ms. 0.3 µs to 100.00 s 5 digits at 1 ms and more, 0.1 µs at less than 1 ms. Oscillation mode: Effective with trigger. Less than 50 ns On and off settable Off: stops at set phase. On: stops at set stop level. −100.0 % (maximum negative output) to +100.0 % (maximum positive output), 0.01 %

8.3 Other functions

8-6 WF1943B

Sweep Sweep items Setting items Sweep functions Sweeping time

Range Resolution

Sweep trigger Sweep trigger period Trigger source External trigger

Polarity Input connector Minimum pulse width

Trigger delay

frequency and phase Sweep start/stop or sweep center/span Sweep start and stop conditions Continuous / single / gated sweep LIN/LOG (LOG is available frequency only)

/ / / 1 ms to 10000.000 s 1 ms Indicates start of single / gated sweep. 100 ms and more (If applying less than 100 ms, trigger is at 100 ms intervals). Selectable internal trigger oscillator or external trigger input. Also, applicable from panel keys and via remote control (GPIB or USB) Selectable rise/fall. Front panel, BNC receptacle (TRIG/SWEEP IN) 200 ns 2 ms

Internal trigger oscillator period Range Resolution

Oscillation stop level

Range

Resolution

1 µs to 100.0 s 4 digits at 1 ms and more, 1 µs at less than 1 ms. On/off setting effective during gated sweep. Off: stop at set phase. On: stop at set stop level. −100.00 %（maximum negative output) to +100.00 % (maximum

positive output) 0.01 %

8.3 Other functions

WF1943B 8-7

Sweep input/output Sweep trigger input Input level Signal characteristic Minimum pulse width Input impedance Input connector Synchronous sweep output Output level Signal characteristics Output impedance Load impedance Output connector

High level ≥ +3.9 V, low level ≤ +1.6 V Single/gated sweep start at rising or falling edge (selectable) 200 ns. At 10 kΩ, pulling up to +5 V Front panel, BNC receptacle (TRIG/SWEEP IN) Combined use with trigger input for gate, trigger and trig’d gate 0/+5 V (open) Low level: sweeping from start to stop High level: Other times (If sweep, high level for about 0.2 ms to 0.5 ms directly before quick change from stop to start.) 50 Ω, unbalanced 45 Ω and more Front panel, BNC receptacle (SYNC OUT) Combined use with SYNC OUT

Internal modulation functions Modulation items Internal modulation frequency

Range Resolution

Internal modulation waveform

FM (FSK), PM (PSK) 0.1 mHz to 500.00 Hz 5 digits at 1 Hz and more, 0.1 mHz at less than 1 Hz.

, , , ,

Setting initialization Functions Initializes nearly all setting contents.

Initialization settings, “3.3 Basic operation(Initialization table)”, cf.

8.3 Other functions

8-8 WF1943B

User-unit function Function Setting items Coefficient setting

Converts to desired units for set up and display. Frequency, period, amplitude, DC offset, phase and duty. Select either [(internal set up) + n] × m, or [log10 (internal set up) + n] × m; then, set the value of n and m. Frequency and period: 15 digits mantissa and 1 digit index (both m and n) Amplitude, DC offset, and duty.: 6 digits mantissa and 1 digit index (m and n) Phase : 7 digits mantissa and 1 digit index

Unit character string Alphanumeric and 34 symbols Set up and display up to 4 characters.

Load function Function

Load impedance

Range

Resolution

Set up and display at actual voltage for an arbitrary load Conversion formula: (Output voltage at load) = (Output voltage at no-load) ×

impedance) (Load+) 50:impedance(Output

impedance) (Load

Ω

45 Ω to 999 Ω 1 Ω

Output on/off Function Output off state Power on state

Output switched on/off FUNCTION OUT: open. SYNC OUT: TTL three states high impedance. Selectable return to the state when the power supply was switched off or output on/off state.

Setting memory, Backup Setting memory Backup Backup period Battery Operation when battery depleted

Nearly all setting items can be stored and recalled. 10 sets from 0 to 9 Battery back up for nearly all settings prior to power off. Three years and more under normal temperature. Lithium cell Error at power on and settings are initialized. Setting memory and arbitrary waveform memory are initialized. Battery needs replacement (fee charged)

WF1943B 8-9

8.4 Initialized settings

Initialized settings

“3.3 Basic operation(Initialization table)”, cf.

Error from backup battery depletion

In addition to setting initialization, following are set: Output on/off Off Output on/off in turning on LAST-STATE (condition just before power off) Setting memory Setting memory comment

ALL NOT STORED " " (blank)

User unit name USER User unit computation formula (h+n)*m User unit coefficient 1 User unit offset Arbitrary waveform selection

0 0: ARB_00

Arbitrary waveform name Arbitrary waveform data size

ARB_00 ~ ARB_11 8 K

Arbitrary waveform data Remote control interface

All 0 GPIB

GPIB address 2 GPIB delimiter CR+LF USB ID 2

8-10 WF1943B

8.5 Remote control

GPIB interface

GPIB function Use code Address Output driver GPIB parameters Remote release Connector

SH1 All source handshake functions AH1 All acceptor handshake functions T6 Basic talker, serial poll, talker release by MLA L4 Basic listener, listener release by MTA SR1 All service request functions RL1 All remote/local functions PP0 No parallel poll functions DC1 All device clear functions DT1 All device trigger functions C0 No controller functions ISO 7 bit codes (ASCII code) 0 to 30 (set from panel) DIO1-8, NDAC, NRFD and SRQ : Open collector DAV and EOI : three state GPIB address (0 to 30), delimiter in transmission (CR/LF+EOI, CR+EOI, LF+EOI) Remote condition can be canceled by LOCAL key. (Except for Local Lockout) Rear panel, IEEE 488 (24-pins) connector

USB interface USB1.1 full speed

WF1943B 8-11

8.6 General items

Input/output ground

The signal ground of FUNCTION OUT and SYNC OUT is floated from the chassis and the input/output ground of these signals is common. Signal ground dielectric strength: 42 Vpeak, 30 Vrms (DC to 20 kHz continuous) The input/output ground of all other signals is connected to the chassis.

Power supply Power supply voltage range AC100 V/115 V/230 V ± 10 % Power supply frequency range 50/60 Hz ± 2 Hz Power supply fuse Time lag 1 A (100 V/115 V) or time lag 0.5 A (230 V) 250 V, φ5.2 × 20 mm Consumption electric power 65 VA and less Overvoltage category II

Cooling Forced-air cooling, rear exhaust

Setup condition Horizontal (Within 10°)

Environmental conditions Ambient temperature and humidity range

Performance guarantee +5 to +35ﾟC, 5 to 85 %RH (no condensation at an absolute humidity of 1 to 25 g/m3) Storage time −10 to +50ﾟC, 5 to 95 %RH (no condensation at an absolute humidity of 1 to 29 g/m3)

Pollution degree 2

Insulation resistance 20 MΩ and more (DC 500 V, power input lines versus chassis).

Withstand voltage AC 1500 V (power input lines versus chassis).

Dimensions 216(W) × 132.5(H) × 290(D) mm (Excluding protrusions).

Mass Mainframe excluding attachments, options, etc. Approx. 4.2 kg,

Safety EN 61010-1: 2001

EMC EN 61326: 1997/A1: 1998/A2: 2001 However, the performance criteria for the following standards are as follows: EN61000-4-2(1995), EN61000-4-4(1995), EN61000-4-5(1995), and EN61000-4-11(1994):B

8.3 Other functions

8-12 WF1943B

External drawing

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WF1943B Index 1

Index

Front and rear panel indications (alphabetical order).

AMPTD··································3-18, 5-6, 5-8, 5-18

ARB······························································· 4-42

ARB EDIT····················································· 4-43

BS·······································3-17, 3-18, 3-19, 3-20

BURST···································3-8, 3-13, 4-2, 4-47

DC ······················3-8, 3-13, 3-16, 3-17, 3-18, 3-19

DUTY·······················································5-3, 5-4

ENTER··························3-3, 3-10, 3-17, 3-20, 5-7

ENTRY··········· 3-17, 3-18, 3-19, 5-2, 5-3, 5-4, 5-5

EXIT······················································· 3-3, 3-10

FREQ···············································3-17, 5-3, 5-4

FUNCTION··················································· 3-14

FUNCTION OUT············································ 3-5

HIGH························································5-5, 5-6

k······························································ 4-45, 5-7

LOW·························································5-5, 5-6

m····························································· 4-44, 5-7

M ····································································· 5-7

MAN TRIG ···································4-8, 4-11, 5-21

MEMORY····················································· 5-13

MODE·································· 3-13, 4-2, 4-15, 4-36

MODU ······3-8, 3-13, 4-36, 4-38, 4-39, 4-41, 4-48

NOISE···························3-8, 3-13, 3-16, 3-17, 5-8

NORMAL ············································ 3-13, 5-22

OFFSET ········································ 3-19, 5-6, 5-18

OUTPUT ······················································· 3-21

OVER······························································ 3-5

PAUSE ········································ 4-19, 4-24, 4-30

PERIOD ············································ 5-2, 5-3, 5-4

PHASE ·························································· 3-20

START ······················4-18, 4-24, 4-29, 4-38, 4-41

STOP················4-18, 4-19, 4-24, 4-30, 4-38, 4-41

SWEEP································· 3-8, 3-13, 4-15, 4-48

SYNC OUT ··································· 3-6, 4-35, 4-47

SYSTEM············3-10, 5-9, 5-16, 5-17, 5-18, 5-22

TRIG/SWEEP IN ··················3-9, 4-8, 4-10, 4-13,

4-19, 4-30, 5-21

UNDO ··························································· 5-19

WIDTH ···················································· 5-3, 5-4

µ ······································································ 5-7

WARRANTY

NF CORPORATION certifies that this instrument was thoroughly tested and inspected and found

to meet its published specifications when it was shipped from our factory.

All NF products are warranted against defects in materials and workmanship for a period of one

year from the date of shipment. During the warranty period of, NF will, at its option, either will repair the

defective product without any charge for the parts and labor, or either repair or replace products which

prove to be defective. For repair service under warranty, the product must be returned to a service

center designated by NF. Purchaser shall prepay all shipping cost, duties, and taxes for the product to

NF from another country, and NF shall pay shipping charge to returned the product to purchaser.

This warranty shall not apply to any defect, failure or damage caused by improper use, improper

or inadequate maintenance and care or modified by purchaser or personnel other than NF

representatives.

NF Corporation

WABUN: (≈DA00012267-002)

If there are any misplaced or missing pages, we will replace the manual. Contact the sales

representative.

NOTES

• Reproduction of the contents of this manual is forbidden by applicable laws.

• The contents of this manual may be revised without notice.

• Information provided in this manual is intended to be accurate and reliable. However, we

assume no responsibility for any damage regarding the contents of this manual.

• We assume no responsibility for influences resulting from the operations in this manual.

Copyright 2005, NF Corporation

WF1943B MULTIFUNCTION SYNTHESIZER Instruction Manual

NF Corporation

3-20 Tsunashima Higashi 6-chome, Kohoku-ku. Yokohama-shi 223-8508, JAPAN Phone +81-45-545-8111 Fax +81-45-545-8191

http://www.nfcorp.co.jp/ NF Corporation6-3-20, Tsunashima-higashi, Kohoku-ku,Yokohama 223-8508 JAPAN

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